You can get B from the process of elimination. The bathroom sink has nothing to do with the main idea (that the man, from not recycling, is "throwing away" the Earth). The facial expression <em>does</em> have something to do with the main idea, but it's more of an emphasis on the main idea. The Earth being thrown away, however, captures the main idea perfectly.
<h3><em>Not to seem desperate or anything but i'm trying to get to virtuoso so i'd really appreciate it if you could give me a brainliest (which you don't have to). thanks :)</em></h3>