单项选择题

Americans enjoy fast food mainly because ________.
[A] it can be eaten in the car [C] one only uses his Fingers while eating it
[B] it is much more tasty than home-made food [D] it is time-saving and convenient

A.Americans enjoy fast food mainly because ________.
B.it can be eaten in the car
C.one only uses his Fingers while eating it
D.it is much more tasty than home-made food [D] it is time-saving and convenient