An advantage of a co-branded card over a general purpose card is that
a. they can be used anywhere.
c. they have special status.
b. the offer special rewards.
d. they are more secure.

An advantage of a co-branded card over a general purpose card is that they offer special rewards. Co-branded cards are sponsored by the card issuer and a retail company like a department store or an airline. There are benefits having the card such as exclusive discounts or other benefits from the retail company.
The answer would be letter B.