Rishabh was punished for his disobedience. (Complex sentence)

Correct option is C

"Rishabh was punished because he was disobedient" is correct. A complex sentence uses a subordinating conjunction ("because") to show the cause-effect relationship between disobedience and punishment.
Information Booster:
1. Complex sentences join an independent and dependent clause.
2. "Because" expresses causality effectively.
3. Maintains the sequence of events logically.
4. Subordinators (e.g., "because," "although") add depth to sentences.
Additional Information:
· (a) so he was disobedient: Misleading; suggests punishment caused disobedience.
· (b) and he was punished: Compound sentence, not complex.
· (d) When Rishabh was punished: Incorrect; alters the sequence and meaning.