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Solutions
A "Talk" cannot be arsonist in itself, however much it may incite arson. It doesn't go with the tenor set by "light hearted" and "comic". Although Option B is enticing, the word "lyrical" is barely used for "talks" and especially not the type that are made over the radio waves. talks cannot be disinterested and altruistic in the action either.
Culpable does not fit into the blank at all, although resonant and loud might. "strident" means something that is harsh and loud. Hence, combining the two, Option D is correct, as talks can most definitely be apolitical.