A major issue that distinguishes pressure groups from political parties is

This question is asking about the main difference between pressure groups and political parties. Pressure groups and political parties are both organizations that aim to influence government policies, but they differ in some ways.

The question gives four options to choose from: ideology, voting patterns, membership, and objective. The correct answer is option D, objective.

The objective of a pressure group is to influence government policies on a particular issue or set of issues. Pressure groups are formed by people who have a common interest or concern, and they work to influence policy makers to make changes that benefit their cause. On the other hand, the objective of a political party is to win elections and gain control of government. Political parties have a broader range of issues that they focus on, and they aim to appeal to a wide range of voters.

In summary, the main difference between pressure groups and political parties is their objective. Pressure groups aim to influence government policies on specific issues, while political parties aim to win elections and control government.