Critics thought that many officials appointed by political machines were

qualified and honest.
experienced and trustworthy.
unqualified and corrupt.
inexperienced and honest.

Critics thought that many officials appointed by political machines were unqualified and corrupt. Option C is correct.

Political machines refers to certain political groups led by a powerful leader or a small group of politicians sharing a personal agenda. The political machine has its own interest and seeks to maintain enough votes in order to maintain the administrative and political power in a state, or city. It is known as machine for the way it works. Some critics considered that many officials appointed by political machines were unqualified and corrupt.

i believe it d) heterogeneous