I don't know exactly but i believe the answer is d
Answer:
I think it is c hope it helps
I would agree with you - the conclusion should leave readers with an important thought at the end.
This thought should never be new, or opposing to the previous ideas you had been writing before. It also shouldn't be confusing, but quite conversely - it should explain everything and put everything in place.
A source that is a trustworthy authority on a subject is a credible source.
