Answer: The correct answer is D. As a co-signer you are responsible for the bills; as an authorized user you are not
Explanation: A co-signer is ultimately responsible for the account if the primary account holder fails to make payments and the authorized user is not. However, a co-signer does not have any ability to make purchases on the account, whereas an authorized user does. While the authorized user is NOT responsible for the account balance and charges, their credit can be negatively or positively affected by the account payment history.