when people fail to live up to the very ideals they hold in highest esteem, exaggeration of such failings often forms the basis of successful comedy.
This conditional statement is the gist of the argument.
Answer choice D is the paraphrased version of the SC, therefore making 'the comedy' trend NECESSARY
, which justifies the conclusion.
Answer E is irrelevant, as what affects the argument is the the condition that 'people fail to live up to the ideals', the degree to which they do so, whether they do it more now than what they did before, does not matter. As long as they still fail to do so AT LEAST
sometimes would justify the consequence(the trend in comedy).
Hope this helps.