The correct answer is B.
A spoils system in politics is a practise within a political party. After the party wins a particular election, it gives government civil service jobs to people who supported it during the campaign and helped them to win.
This practise began during the administration of President Andrew Jackson, in 1892. Jackson wanted to introduce some changes in the way the federal government operated. Because he ran into considerable opposition, he came up with the idea of replacing the 'enemies' with employees considered loyal to his administration.
Jackson's policy of replacing federal employees with his supporters was denounced as unfair by his political opponents. The term spoils refers to goods and benefits taken from the loser in a battle or an election.