The correct option is B. admission of a new partner. Detailed Explanation In a partnership, the admission of a new partner signifies a significant change in the structure and dynamics of the partnership. Here’s a step-by-step breakdown of why this condition leads to the dissolution of the partnership:

1. Definition of Partnership: A partnership is a business arrangement where two or more individuals share ownership and the responsibilities of managing the business. The terms of the partnership, including profit sharing, decision-making, and responsibilities, are typically outlined in a partnership agreement.
2. Nature of Partnership Changes: When a new partner is admitted, it alters the original agreement and the relationship among the existing partners. This change can affect profit-sharing ratios, decision-making authority, and the overall management of the partnership.
3. Legal Implications: The admission of a new partner usually requires the dissolution of the existing partnership and the formation of a new one. This is because the original partnership was formed based on the agreement and consent of the existing partners. The new partner's entry necessitates a reevaluation of the partnership terms, which legally constitutes a new partnership.
4. Partnership Agreement: Most partnership agreements include clauses that specify how new partners can be admitted and the process for dissolution. If the agreement does not allow for the admission of new partners without dissolution, then the partnership must dissolve to accommodate the new partner.
5. Practical Example: Consider a partnership of two individuals, Alice and Bob, who have been running a bakery together. If they decide to admit a new partner, Charlie, they must dissolve the existing partnership and create a new partnership agreement that includes Charlie. This new agreement will outline how profits are shared, how decisions are made, and other operational details.

Why the Other Options Are Incorrect

• A. Change of partnership's head office:
• This option does not lead to dissolution. Changing the location of the partnership's head office is an operational decision and does not affect the legal structure or the agreement among partners. The partnership can continue to operate under the same terms regardless of where the head office is located.
• C. Purchase of a large quantity of fixed asset:
• Similar to option A, purchasing fixed assets is a business decision that does not necessitate the dissolution of the partnership. Partnerships can acquire assets as part of their normal operations without changing the partnership structure.
• D. Retirement of a manager who is not a partner:
• The retirement of a manager who is not a partner does not impact the partnership itself. The partnership can continue to operate with the remaining partners, and they can hire a new manager without needing to dissolve the partnership.

Summary of Key Points

• The admission of a new partner requires the dissolution of the existing partnership and the formation of a new one due to changes in the partnership agreement.
• Changes in the head office or the purchase of assets do not affect the legal structure of the partnership.
• The retirement of a non-partner manager does not necessitate dissolution, as it does not alter the partnership's core structure.
• Understanding the implications of changes in partnership dynamics is crucial for managing partnerships effectively.

This thorough understanding of partnership dynamics is essential for anyone studying financial accounting, particularly in the context of partnerships and their legal implications.