2. Which is in the correct format?
A. If the polar ice caps begin to melt, the amount of salt in the ocean water will change.
B. If Mr. Johns listens to loud music, then he will not be able to hear well.
C. A propeller with large blades can propel an airplane faster than a propeller with smaller blades.
D. Mr. Howard uses mind control on his students to help them do better on tests and quizzes.