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.
Explanation:
Option B: Don't guess is in itself a full sentence and should be followed by a full stop. Thus, this is grammatically incorrect. Option C: Since comma should follow sank, this is also grammatically incorrect. Options A and D are grammatically correct sentences. Thus, the correct option is A.
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