How may novels have been published during, the lifetime of William Faulkner

A．they don't like to keep their eyes on the face of the speaker
B．they need not communicate through eye contact
C．they don't think it polite to have eye contact
D．they didn't have much opportunity to communicate through eye contact in babyhood

A．prove that foreign experts are important for the U. S.
B．prove visa system used to be more effective in the past
C．show that visa system was not really necessary in the past
D．explain that countries have always been competing for professions