The Television Industry Was Directed to Develop a Rating System

The television industry was directed to develop a rating system for TV programs,and manufacturers were directed to include the so-called "V-chip" in most new TV receivers,by:

A) a presidential executive order.
B) a rule of the Federal Trade Commission (FTC) .
C) the Children's Television Act of 1990.
D) the 1996 Telecommunications Act.
E) none of these--no such requirement exists.