Answer for the second blank is “(E) tepid” I doubt why not “(D) clangorous”?
The sentence is talking about a concert where the performers talent was elegant and polished however the place where the concert took had some issue
The 2 blanks support each other
I reused the word unresonant and chose tepid for second blank while for the first because the tepid or calm the setting exacted a toll where the concert took place
So I guess A and E are right.