Why did pope gregory vii and henry iv come into conflict?

does anybody know what the answer is... heres the choices.

A. The pope claimed the authority to remove the emperor from the throne.

B. The pope named a different emperor to replace Henry.

C. Henry's land was seized by the pope.

D. Henry tried to remove the pope from power.

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.