A Hyperbole is an exaggeration of something, it is the use of statements that are so exaggerated that are not supposed to be taken in its literal meaning.
Therefore the correct option is D) an overstatement or exaggeration.
The other options are not correct because the use of mimic sounds and the comparisons represent other literary devices.
The sentence that best represents the function of a supporting sentence is, option B. It adds more details to the topic sentence. The supporting sentences make up the paragraph that talks about the main sentence. The supporting sentences not only add more information about the topic, but also add examples to further explain the main sentence.