Question

under jacksons spoils system, the political party of a new president could
award grants to states that supported him.
reward supporters with government jobs.
appoint federal employees for life.
keep opponents from speaking against him.

Explanation:

Jackson's spoils system was about giving government jobs to political supporters. The first option (award grants to states) isn't related. The third (appoint for life) is incorrect as jobs were given to supporters, not for life. The fourth (silence opponents) isn't part of the spoils system. So the correct one is rewarding supporters with government jobs.

Answer:

B. reward supporters with government jobs.