A is correct because the source of debit or atm cards are either your checking or savings account and there is actual/available money. Therefore, you can withdraw them.
B. is incorrect. Credit cards offers more fraud protection and that they will find all means to get their money. It's probably to secure them too since they up fronted the payment for you. For debit cards, it has lesser fraud protection and that you'll have to do find a way to get your own money back.
C. is wrong. Debit cards does not require signatures but uses a PIN to complete or acknowledge a transaction.Credit cards uses the client's signature.
D. is also incorrect since debit cards are your actual funds that you have on your account. Unlike in credit cards, since it's a loan, they charge the interest rates.