C. details. While everything else is also important, you need details to make the writing more than just a summary.
Answer:
The black market often sets a price for foreign exchange that is several times the official one. Examples of goods traded in the black market are weapons, illegal drugs, exotic and protected species of animals, and human organs needed for transplant surgeries.
Black markets typically arise when the government attempts to control prices or imposes an excessively high tax burden on transactions. For example, when a government imposes price controls on fuel, individuals willing to pay more than the fixed rate will form the demand side of a black market.
C. would be the correct answer
I think that out of courtesy for Shakespeare the original quote from the play Julius Cesar could be mentioned but since it is a paraphrase of the quote and not the exact words spoken by Mark Anthony then I think it is not absolutely necessary to cite the source.
If you study over the course of a week, you have a better chance of remembering the material than if you study for a couple hours the night before and cram.