How did the question of tariffs further divide the country prior to the civil war?
tariffs were increased for slave states but not for free states.
tariffs required a military force to manage and collect them.
tariffs caused debate about the size and strength of a national government.
tariffs were unevenly applied to certain industries, heavily favoring the north.

Tariffs are the taxes on import and export.

The correct answer is:
Tariffs were unevenly applied to certain industries, heavily favoring the North.

The uneven application referred to foreign manufactured goods, which had high import taxes on them and foreign raw materials did not have tariffs imposed on them. This favoured the North, as it was also manufacturing goods, and disvafoured the south, which was producing raw materials too.