S1: It's 14:20. S2: 14:20, OK. Q: What are they doing?

S1: It's 14:20. S2: 14:20, OK. Q: What are they doing?

A.They are checking the engine telegraph.

B.They are checking the main engine

C.They are correcting the clock.

D.They are talking about the main engine

正确答案是C