The answer is definitely D.
MIT defines calculus as the study of change, usually in motion.
African art<span> is </span>mostly used to<span> communicate with spiritual powers</span>
C.European ideals have influenced american political culture
When someone is described as a "martyr", all this means is that this person died for a cause they they believed in, and that their death inspired others to follow in the cause in question, often in the face of opposition.