Explanation:

- An agreement to remain unmarried is

- Usually considered void because it goes against public policy by restricting the freedom to marry.

- Courts often don't enforce agreements that limit personal rights like marriage.

- Options explained:

- Valid: Legally recognized and enforceable. Generally not applicable here.

- Void: Not legally enforceable from the start. ? Correct Answer: Void

- Voidable: Valid unless declared void. Not typically applicable here.

- Enforceable: Legally binding and can be compelled by law. Not the case here.

Correct Answer: Option 2: Void