In this passage, "artificial food" refers to food made from ______.

A．Entertainment in small towns.
B．Americans' adjustment to a moving society.
C．The life style of Americans in the past.
D．Personal relations in small communities.

A．he is a lazy person
B．he refuses to follow his own energy cycle
C．he is not sure when his energy is low
D．he is at his peak in the afternoon or evening