Word choice is used to get a point across. So if you look a choice A, the author definitely does not feel that the manufacturers are striving to provide COMPLETE information (or there wouldn't be the questions). I would say the same thing for D, making that an incorrect answer. Looking at B and C, the author does use exaggeration in personification, but he doesn't mention sales. He does however set a frustrated tone and touches on confusion of the customers, so I feel that C is the best answer here.
Answer: They create a cramped and uncomfortable feeling
Explanation:
The correct answer is B supporting evidence
Answer:
He was thrumming against the desk, even though I asked him not to.
Explanation:
I believe thrum means to beat against something because it sounds close to drum.