Answer: guess from context
Explanation:
D. subjective noun!
If you view examples of the seven line poem, you can identify that the top line is more than likely a subjective noun.
in that paragraph, the expression Mounting evidence could be a bit confusing, but it indicates that there's been reaserch about it before, and that it all points in the same direction, the more research proving the same point means the data is convincing. The answer is D.
