Question

the idea of political efficacy means that people will vote if they believe which of the following?

the election is already decided.

their vote can make a difference.

their neighbors agree with them.

it doesnt matter who wins.

Explanation:

Political efficacy refers to the belief that one's political participation (such as voting) can have an impact. If people think their vote can make a difference (i.e., have an impact on the political outcome), they are more likely to vote. If they believe the election is already decided, their neighbors' agreement, or that it doesn't matter who wins, these do not relate to the core concept of political efficacy which is about the impact of one's own action (voting).

Answer:

Their vote can make a difference.