Answer:
A, C, and D will be your answers.
That statement is true
When presidents are elected with popular mandate, it is very easy for the presidents to pass any laws that he/she wants because their sheer popularity would give overwhelming public support that put pressure for the opposition to conform.
Since Kennedy was elected by a slim margin, a large portion of public still oppose his policies during earlier years of his presidency. This make it easy for his opposition to limit his movement so he can't pass the policy that he wants.
The question has a definition word of "copperheads" which is something they want you to define. So if you rearrange the question, it can be a multiple choice question stating:
Copperheads were midwesterners who sympathized with the south and objected to
A) abolition
B) slavery
Abolition is to over throw something and start a new version of what has been overthrown
Slavery was the ownership of African Americans (seeing as this question was linked to the civil war)
Hope you can find the answer easier now (:
