Which of the following were features of the 1937 Housing Act?
I. It established a permanent public housing program in the U.S.
II. It tied slum clearance to public housing.
III. It established Section 8 housing, which authorized the payment of rental housing assistance to private landlords.
IV. It created the Community Development Block Grant (CDBG) program.
A. III only
B. I and III only
C. I, II, III and IV
D. I, II, and III only