The Comstock Act Regulated Obscene Materials by

The Comstock Act regulated obscene materials by

A) banning obscene materials from entering (and thus leaving) printing presses.
B) banning obscene materials from supermarkets, department stores, and barber shops.
C) regulating what could be mailed through the U.S. postal service.
D) regulating the sales and distribution of obscene materials by requiring a federal stamp on all such materials, which the government never printed.