HM Had Much of His Hippocampus Removed to Alleviate Seizures

H.M. had much of his hippocampus removed to alleviate seizures. An unfortunate side effect was impaired explicit memory, even though later testing revealed his implicit memory was spared. In order to establish a double dissociation, which of the following patients would need to be found?

A) a patient with intact implicit memory and intact explicit memory
B) a patient with an intact hippocampus and explicit memory deficits
C) a patient with intact explicit memory and impaired implicit memory
D) a patient with explicit memory intact and a damaged hippocampus