From the sentences below, identify where comma(s) is/are missing and/orinappropriately used grammatically:
A. Don’t guess. Use a timer or watch.
B. Don’t guess, use a timer or watch.
C. The driver managed to escape from the vehicle before it sank and swam to the river-bank.
D. The driver managed to escape from the vehicle before it sank, and swam to the river-bank.

A

B, C are incorrect

B

B, D are incorrect

C

A, C are incorrect

D

Only B is incorrect