The thing which the words "mounting evidence" suggests about the author's intended meaning in paragraph 3 of this passage is D. There are many reports on the topic.
This refers to the implied meaning of a word according to the available context for a better understanding.
Hence, we can see that based on the use of connotative meaning, we can infer that from paragraph 3 of the text, the words "mounting evidence" means that there are many reports on the topic.
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