Alec Believes That He Can Tell by the Feeling in His

Multiple Choice

Alec believes that he can tell by the feeling in his head when his blood pressure is high. He says the feeling goes away quickly if he takes his medicine but can last all night when he doesn't take his medicine. Alec is using a

A) health regimen.
B) commonsense model.
C) medical technique.
D) natural barometer.