Final answer:
Option (C), The figure of speech used is hyperbole, which involves exaggeration to emphasize the intensity of the animal's roars.
Step-by-step explanation:
The figure of speech in the sentence "His roars of high intensity are probably the most explosive sound in all the animal kingdom!" is C) Hyperbole. Hyperbole is a figure of speech that is characterized by the use of exaggeration for emphasis or effect.
In this case, describing roars as "the most explosive sound in all the animal kingdom" is an exaggeration, as there are many loud sounds in the animal kingdom and "most explosive" is a subjective measurement. Although loud, it is unlikely the roars are literally the most explosive sound without scientific comparison. This hyperbolic statement is meant to impress upon the reader the intense loudness of the animal's roar rather than to be taken as a factual statement.