One argument against the spoils system was that it 1.did not reward loyal supporters.
2.was unbiased and too rigid.
3.was a hard process to understand.
4.might lead to abuses of power.

the  wilmot proviso  was designed to eliminate  slavery  within the  landacquired as a result of the mexican war (1846-48). fearing the addition of a pro-slave territory, pennsylvania congressman david  wilmot proposedhis amendment to the bill.

the correct answer is b.