Explanation:

- Proletarian refers to members of the working class or the common people.

- Option 1: Firearm - This is a weapon, which is not an antonym for proletarian.

- Option 2: Aryan - Historically a term used for a particular ethnic group, not related as an antonym here.

- Option 3: Aristocratic - This relates to the upper class or nobility, the opposite of proletarian as it refers to the elite or ruling class.

- Option 4: Low - This usually refers to something below a certain level, not directly opposing "proletarian".

- Correct Answer: Option 3, aristocratic.