formal's description is belonging to a form of formal cause,relating outward form arrangements of elements, structures, relationships rather than logic.
Formal is something that follows rules, it is a dressy or important occasion, or it may be something that has an official sanctioning or approval. One example of formal is a dinner party at a mansion where everyone dresses up in fancy clothes and is very polite.
Explanation: 2 Reasons. One, it makes more sense than the others. And two, it isn't talking about an actual gun so not d. Why would he need muscles? Answer that. If you can't it's not C. B....Just no. So A.