单项选择题
Paul drove m miles in h hours; Michelle drove the same distance in an hour less. How fast, in miles per hour, did Michelle drive()
A.A B.B C.C D.D E.E
A、 if the quantity in Column A is greater B、 if the quantity in Column B is greater C、 if the two quantities are equal D、 if it is impossible to determine which quantity is greater
A. 35% B. 50% C. 60% D. 75% E. 90%