Correct Option: D. Encourages the proliferation of parties Detailed Explanation: Proportional representation (PR) is an electoral system designed to allocate seats in a legislature in proportion to the votes each party receives. This system contrasts with winner-takes-all systems, such as first-past-the-post, where the candidate with the most votes wins, often leading to a concentration of power in a few dominant parties.

1. Encouragement of Multiple Parties:
2. In a PR system, even smaller parties can gain representation if they receive a sufficient percentage of the vote. This means that voters have more choices and can support parties that align closely with their views, rather than feeling compelled to vote for a major party just to avoid "wasting" their vote.
3. For example, if a party receives 10% of the vote, it can secure approximately 10% of the seats in the legislature. This incentivizes the formation of multiple parties, as various groups can find a niche and represent specific interests or ideologies.
4. Diversity of Representation:
5. The proliferation of parties allows for a broader spectrum of political opinions and interests to be represented in government. This can lead to more comprehensive policy discussions and a government that reflects the diversity of the electorate.
6. In contrast, in a first-past-the-post system, smaller parties often struggle to gain traction, leading to a political landscape dominated by two major parties, which may not fully represent the electorate's views.
7. Coalition Governments:
8. With many parties in the legislature, it is common for no single party to achieve an outright majority. This often leads to coalition governments, where multiple parties must work together to form a governing body. While this can lead to political instability, it also reflects a wider range of views and can encourage compromise and collaboration.

Why Other Options Are Incorrect:

• A. Reduces the chances of political instability:
• This option is misleading. While PR can lead to a more representative government, it often results in coalition governments, which can be unstable if the parties involved have significant ideological differences. Therefore, while PR can enhance representation, it does not inherently reduce political instability.
• B. Favors the development of a two-party system:
• This option is incorrect because PR systems typically lead to a multi-party system rather than a two-party system. In fact, the opposite is true: PR encourages the emergence of multiple parties, as smaller parties can gain representation based on their share of the vote.
• C. Discourages voting along ethnic lines:
• While PR can promote a more inclusive political environment, it does not inherently discourage ethnic voting. In some cases, ethnic parties may still emerge and thrive under PR systems, as groups seek representation that reflects their specific interests. Therefore, this statement is not universally true.

Revision Summary:

• Proportional representation encourages the formation of multiple political parties by allowing smaller parties to gain legislative seats based on their vote share.
• It leads to a more diverse representation of political opinions and interests in government.
• Coalition governments are common in PR systems, which can lead to both collaboration and potential instability.
• PR does not inherently reduce political instability or favor a two-party system, and it does not necessarily discourage ethnic voting.