A and C are both correct to a degree. He is well known for his peculiar geometric forms in his paintings, which were not at all realism, but rather a style called cubism. During his Blue Period, his paintings were literally painted in blues, and were true to the answer in C. One particular painting depicts an elderly man playing a guitar with a frown on his face looking incredibly sad and upset. I would probably select C because it describes his Blue Period in contrast to his typical style, which is described in A.
The writer of the Book of Deuteronomy set the story into the framework of three sermons by Moses to the Israelites as they stand on the plains of Moab poised to cross the Jordan River and enter the Promised Land.