Why don't we listen to music?

Cau 28
Why don't we listen to music ?
A. O How about listen to music?
B. O What about listening to music ?
C. O Let's listen to music?
D. O Shall we listening to music ?
Cau 29
His uncle works..... hours than his father.
A. O few
B. O less
c. O much
D. O more