Which is the appropriate word to complete the sentence?

reform elements such as the recall, the referendum, and the initiative were primarily designed to give power to

a.) trusts
b.) political machines
c.) voters
d.) monopolies

Reform elements such as the recall, the referendum, and the initiative were primarily designed to give power to voters. The correct option among all the options that are given in the question is the third option or option "C". I hope that this is the answer that you were looking for and it has come to your help.

The one that most represents the earths mantle would be the skin since the mantle is the upper part of the earths depths which is just like the skin of an apple.

That is true , instead try to have a sit down talk with them