I was marked only partially correct in answering the question: Another way of saying "Vous vous souvenez des îles Cyclades" is "Vous ________ îles Cyclades"

I answered “Vous vous rappelez des îles Cyclades” and was informed that Vous vous rappeles des was another possibility.

Why do you not receive full credit if an answer is correct regardless of other options in this case?

In conjugation tables, I have not seen this ending with vous.  Could you please address this issue?

Thank you.