Factors Contributing to the Problem of Commercial Clutter During Prime

Factors contributing to the problem of commercial clutter during prime time viewing hours include:

A) the tendency of the networks to add more commercials to hit shows because they can charge higher rates
B) advertisers and agencies pressuring networks to put their commercials in top-rated shows which attract the largest audiences
C) the airing of commercials for directly competing products during the same program
D) the development and airing of 15-second commercials
E) all of the above