What was the main reason that most northerners were opposed to the Fugitive Slave Act? A. They resented being forced to help slave owners.
B. They felt it would encourage slaves to rebel.
C. They felt it gave the government too much power.
D. They resented being forced to help abolitionists.

A. They resented being forced to help slave owners.

Explanation:

Most northerners were abolitionists, and did no believe in slavery. Some, if not most, also took it upon themselves to help slaves escaping. To be forced to catch slaves and return them was against the societal standards norm of the days in the North, and many did not support the Fugitive Slave Act.

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d) in the state of iowa