Fact Checking Political Advertising by Media Outlets Is Supposed to Alert

Fact checking political advertising by media outlets is supposed to alert voters to campaign distortions,

A) but most people already know the facts so the costly analysis is unnecessary.
B) so the political process can run more smoothly.
C) but most people polled said that they trusted political advertising more than the media.
D) but it is unnecessary because most political advertising is very truthful.
E) as well as abuses, so candidates can be brought up on criminal charges.