Incumbents have an advantage over their challengers because:
select one:
a. the cost of their race is much lower.
b. they have open seat elections.
c. they get 80 percent of pac contributions.
d. their race is uncontested.
e. their districts don’t get reapportioned.

The answer is D. They get 80 percent of PAC contributions.

Explanation:

Political Action Committees are campaign collectors. They pool funds from their members and donate these funds to campaign for or against a particular candidate.

PACs usually give an overwhelming proportion of their campaign funds (about 80percent of their contributions) to incumbents. This, they believe is good investment because of the positive re-election rates these incumbents have.

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.

where is the rest of the question. this isn't making sense. can you upload a picture of the question?