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

A．Both Tennessee William and William Faulkner are playwrights.
B．Tennessee William was a major voice who spoke for the troubled people in southern America.
C．Like Faulkner, he once won Nobel Prize for Literature.
D．Tennessee William had to pursue his writing career through difficult times.

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