All of the following methods were used by northerners to resist the capture of slaves except
a.
slaves move north on the undergound railroad
c.
paying for the freedom of runaway slaves
b.
bringing slave owners to trial for abuse
d.
refusing to convict those accused of fugitive slaves

b. bringing slave owners to trial for abuse.

Explanation:

This was not a method used by Northerners to resist the capture of slaves. The main reason for this was the fact that Northerners would not have had the law on their side. Slavery was legal, and the abuses of slaveowners were usually not prosecuted. Therefore, if Northerners had tried to bring slave owners to trial for abuse, it is likely that the result would not have been a positive one.