One part of the discrepancy is the fact that the advertisements should be legal. (A) contradicts this fact by saying these advertisements shouldn’t be legal. Denying one of the facts doesn’t help resolve the discrepancy.

What the government should do with fattening foods doesn’t impact what the government should do with cigarettes.

But how can the government still be justified in attempting to prevent cigarette advertisements from being shown? This answer doesn’t provide a potential answer.

Even though cigarette advertisements should be legal, the government can be justified in preventing cigarette advertisements through financial disincentives. For example, maybe taxing the ads could get cigarette companies to refrain from showing ads.

Part of the discrepancy is that the government is justified in trying to prevent cigarette advertisements. (E) contradicts this part of the discrepancy by saying the government should not try to prevent the ads. Contradicting one part of the discrepancy doesn’t help explain it.