Which of the Following Individuals Is Suffering from Retrograde Amnesia

Which of the following individuals is suffering from retrograde amnesia?

A) Eva;after waking up from a coma,Eva cannot recall why she is in the hospital or her family members' names.
B) Adam;after recovering from a concussion,Adam cannot encode or store any new information with which he is presented.
C) Amy;while attending her psychology class,Amy cannot remember lecture materials well because the material from her previous sociology class keeps showing up in her mind.
D) Michael;while reviewing what he learned in class one day,Michael is unable to recall information he learned from chemistry class in the morning because he keeps thinking about material covered in math class in the afternoon.