A salesman makes a profit of 25% on all sales. How many fax machines will he have to sell for $375 each to make a total commission of at least $ 500 ？（）

A.4

B.5

C.6

D.15

E.20

I won’t watch the TV play if my father ________ me do my homework.[ ]

A.let

B.will let

C.won’t let

D.lets