Final answer:
Option A is the best revision to use an active voice by making Aaron's big brother the doer of the action, providing clarity and engagement.
Step-by-step explanation:
The best revision for the sentence that emphasizes the use of active verbs is option A: "Aaron's big brother calls him 'small fry' when they are hanging out at home." This sentence effectively places Aaron's brother as the doer of the action and uses an active voice, making it clearer and more engaging for the reader. Sentences written in active voice tend to be more straightforward and dynamic, leading to stronger and more concise writing, which is preferable in most contexts.