Explanation:

- Affluent refers to having a great deal of money; being wealthy or prosperous.

- Option 1: Strong means having power or force, physically robust. It does not relate to financial status.

- Option 2: Joyous implies being full of happiness or joy, which is unrelated to wealth or money.

- Option 3: Wealthy is a synonym for affluent, as both describe someone with substantial financial resources.

- Option 4: Clever describes someone who is quick to understand, learn, or devise strategies, and is not synonymous with financial wealth.