W: Why didn’t your uncle fly to Beijing
M: It would have cost $420. The train fare is only $120.

How much did the man’s uncle save（）

A. There won’t be any neighbors in the new apartment.
B. The neighbor won’t return late any more.
C. She wants to have a quieter place.
D. She doesn’t want to have neighbors.

A.$3. 
B.$4.5. 
C.$6. 
D.$9.