Answer:
The correct answer is the first, They feared competition from black workers.
Explanation:
The reason why some northern workers opposed abolitionism was because they saw the liberation of black people as a potential threat to their jobs because of competition.
It must be said though that records show it was a minority of norther workers who were explicitly and actively <em>against</em> abolitionism. Most of the time workers weren't active supporters because they saw themselves as wage slaves struggling to survive who didn't have time to fight for anything else.
The Nullification Crisis of 1832 centered around d) southern opposition to tariffs. "The Nullification Crisis was a sectional crisis in 1832-33, during the presidency of Andrew Jackson, which involved a confrontation between South Carolina and the federal government. The crisis ensued after South Carolina declared that the federal Tariffs of 1828 and 1832 were unconstitutional and therefore null and void within the sovereign boundaries of the state."
C. Agreements about peace treaties between Egypt and Israel and for peace in the Middle East
