What Have Psychologists Learned About Memory from Studies of the Patient

What have psychologists learned about memory from studies of the patient H.M.?

A) It is possible to lose the ability to store new memories, without necessarily losing the ability to recall old memories.
B) The corpus callosum is particularly important for maintaining communication between the left and right hemispheres of the cortex.
C) People with amnesia are more likely to lose their procedural memories than to lose their factual memories.
D) It is possible to form new long-term memories even after losing all ability to form short-term memories.