Over the Last Few Years, Sakura's Grandmother Has Become Forgetful

Over the last few years, Sakura's grandmother has become forgetful, confused, and disoriented. Sakura goes with Grandmother to have cognitive testing done, and afterward the doctor says that Grandmother's procedural, semantic, episodic, and prospective memories are all affected. Grandmother probably

A) has Alzheimer's disease.
B) is experiencing normal decay of the memory trace.
C) is dealing with interference, since she has learned so many things over the years.
D) is repressing things she doesn't like to think about.