The word <em>whom </em>in this sentence is used as 2. object of a preposition.
Since it can be found after a preposition <em>for, </em>it is object of a preposition.
The best revision of the sentence that avoids the misconception is "Moreover, the constant exposure of ads is annoying" to avoid the misconception. The misconception that can happen here is the notion that the advertising is exposing someone. To eliminate this misconception, the sentence must be made<span> more effective. Thus, the revision above is the best way to avoid it.</span>
Hello, the answer is B. Searched for :)