What is one difference between a more and a folkway?

a. mores may carry serious consequences if violated; folkways do not.

b. mores encourage social rebellion; folkways do not.

c. mores are constructed based on norms; folkways are not.

d. mores are legally acceptable to violate; folkways are not?

I believe the answer is: Mores may carry serious consequences if violated; folkways do not.

even though both mores and folkway contains some sort of line between what's right and wrong, the rules that exist in folkways only regulates small social convention (such as how to dress and how to talk)

Mores on the other hand, regulates bigger social convention such as ancestry or adultery.