The correct answer is A. Debit cards withdraw money directly from your account.
Explanations:
B. Debit cards offer less fraud protection than a credit card; the money has already left your hands whereas with credit cards it doesn't until the end of the month.
C. Debit cards do in fact require signatures. Yeah.
D. Debit cards charge much lower rates (if any, depending on the bank) because you are paying up front versus waiting until the end of the month when you will likely be charged interest and/or fees.
Hope I helped!