Correct Option: D. Purchases Journal Explanation of Why the Answer is Correct: A creditors control account, also known as accounts payable control account, is a summary account in the general ledger that reflects the total amount owed to all suppliers (creditors) at any given time. This account is crucial for managing a business's liabilities and ensuring that payments to suppliers are tracked accurately.

1. Purchases Journal:
2. The purchases journal is where all credit purchases of goods and services are recorded. When a business buys goods on credit, it increases its liabilities to suppliers. Each entry in the purchases journal will typically include the supplier's name, the amount owed, and the date of the transaction.
3. When these transactions are recorded in the purchases journal, they are subsequently posted to the creditors control account. This means that the total amount of credit purchases directly affects the balance in the creditors control account, making this the most relevant source for posting to that account.

Why the Other Options are Wrong or Weaker: A. Supplier's Invoices: - While supplier invoices do provide details about amounts owed, they are not directly posted to the creditors control account. Instead, they are used to record transactions in the purchases journal. The invoices serve as supporting documents for the entries made in the purchases journal, but they do not represent a systematic record of all credit purchases. B. Cash Disbursements Journal: - The cash disbursements journal records all cash payments made by the business, including payments to creditors. While this journal is important for tracking cash outflows, it does not record the initial credit purchases. Instead, it reflects the reduction of liabilities when payments are made. Therefore, it is not a source for posting to the creditors control account. C. Subsidiary Debtors Ledger: - The subsidiary debtors ledger is used to track amounts owed to the business by its customers (debtors). This ledger is separate from the creditors control account, which deals with amounts owed to suppliers. Thus, it is not relevant for posting to the creditors control account. Summary of Key Points:

• The creditors control account is primarily affected by credit purchases recorded in the purchases journal.
• Supplier invoices support the entries in the purchases journal but are not posted directly to the creditors control account.
• The cash disbursements journal records payments made to creditors, not the initial credit purchases.
• The subsidiary debtors ledger tracks amounts owed by customers, not amounts owed to suppliers.

Revision Summary:

• Creditor Control Account: Reflects total amounts owed to suppliers.
• Purchases Journal: Main source for posting to the creditors control account.
• Supplier Invoices: Support purchases journal entries but are not posted directly.
• Cash Disbursements Journal: Records payments, not credit purchases.