The underlined phrase work up in Quiz I means （）

A．the difficulties of exercising
B．why exercising is good for your health
C．important information to know about exercising
D．why people have some wrong ideas about exercising

A. After a reporter compared his dunk to flying.
C. After he won the "Most Valuable Player" in NBA.
C. In his freshman year in the university.
D. In his first year in NBA.