One argument against the spoils system was that it
a. did not reward loyal supporters.
b. was unbiased and too rigid.
c. was a hard process to understand.
d. might lead to abuses of power.

The correct answer is D. The expression spoils system describes a practice by which the political parties of the government distribute institutional positions and positions of power between their own militants and sympathizers.

The origin of this political behavior is based on the system of political clientelism, which can lead to an abusive distribution of positions.