Answer :
I'm not completely sure, but I think d because it really helps to show that rumors aren't good with the use of "like the reek of rotten eggs." It really paints a picture of what it means.
Answer: D. (Rumors) Whispers of doubt filled the empty halls like the reek of rotten eggs.
Explanation: when writing, one of the best ways to explain a concept, an idea or a perspective is to use figurative language, because in this way the reader creates a mental image of the idea and it is easier to understand. From the given sentences the one that most effectively translates the abstract concept is the one corresponding to "rumors" because it compares the rumors with the reek of rotten eggs, creating a mental image.