Ira First Suspected He Had Alzheimer's When He Found Himself

Ira first suspected he had Alzheimer's when he found himself boarding a bus with no idea of where he was planning to go. As the bus made its way uptown, the pain in his tooth reminded him that he was going to see his dentist, but now he panicked as he couldn't remember where the office was located. Ira's first symptoms of what appears to be Alzheimer's disease were

A) behavioral.
B) cognitive.
C) emotional.
D) motor.