Step 1: Meaning of next friend/guardian.
Under Order 32 CPC, a minor must sue or be sued through a next friend/guardian.
Step 2: Disqualifications.
- A minor cannot be guardian.
- An opposite party cannot represent as guardian.
- Written consent is mandatory; without it, appointment is invalid.
Step 3: Conclusion.
All listed conditions disqualify a person. Correct answer is (D).