Which part of real GDP fluctuates most over the course of the business cycle?

According to Joseph Schumpeter, which of the factors of production is central to economic growth?

A) natural resources B) land C) labor D) the entrepreneur

"As the price of apples goes up, the demand for apples goes down." The author of this statement

A) implies that price and demand are unrelated. B) uses the word "demand" when he should use the word "supply." C) uses the word "demand" when he should use the words "quantity demanded." D) implies that demand and price have a direct relationship.