Why was an amendment to abolish slavery not ratified?

a) congress believed that states that permitted slavery would eventually realize the harshness of it and stop on their own.

b) slave owners picketed and campaigned to allow slavery to continue.

c) plantation owners refused to continue making cotton if they were not allowed to continue having slaves.

d) in order to amend the constitution, three-fourths of the states had to approve the amendment, and only fifty percent approved the amendment.