OE


Most people don't like advertisements, and if they are seeing/hearing 3,000 to 5,000 of them per day, they are probably fairly upset - the first missing word should reflect this. Although some commercials might be edifying (instructive or beneficial), this passage clearly focuses on the downsides of advertising rather than the positives - eliminate edification. Trepidation is too strong a word; consumers are irritated by advertising, but they do not experience tremulous fear or agitation. The correct answer is disgruntlement, which means discontent or sulky dissatisfaction.
The second missing word probably also focuses on the frustration of consumers - irritatingly, perhaps. Consummately does not continue with this theme, and it would in any case be redundant coming directly after effectively (it means completely or perfectly). Nefariously (wickedly or heinously) is probably an overstatement; it is better to avoid such strongly condemnatory words unless you have a very compelling reason to believe the passage requires one. This leaves you with obtrusively (obtrusive means meddlesome or blatant), which makes sense in the context of the passage without being repetitive.
Finally, we need to find a word to describe the kind of marketing we are exposed to - most likely one that once more draws attention to its prevalence or frequency. "Dearth" clearly will not work; it means inadequate supply or lack. Parlance (a way of speaking or an idiom) is not particularly relevant to this passage, which focuses on the quantity of ads we are exposed to, not on the kid of language they use. The correct answer is barrage, which means an overwhelming quantity or explosion, and therefore best conveys the notion that we are constantly subjected to ads of one kind or another.