Step 1: Pāli Vyākaraṇa texts.
Pāli language meṁ kuch pramukh vyākaraṇa granth hai—Kaccāyana vyākaraṇa, Moggallāna vyākaraṇa, aur Saddanīti.
Yeh sab Pāli Buddhist literature ke antaragat likhe gaye.
Step 2: Mahābhāṣyam.
Mahābhāṣya, Patañjali kṛt ek Sanskrit vyākaraṇa granth hai jo Pāṇini kṛt Aṣṭādhyāyī par bhāṣya hai. Yeh Pāli granth nahīṁ hai.
Step 3: Analysis of options.
(1) Kaccāyana vyākaraṇa – Pāli text.
(2) Moggallāna vyākaraṇa – Pāli text.
(3) Mahābhāṣyam – Sanskrit text, not Pāli. (Correct).
(4) Saddanīti – Pāli text.
Step 4: Conclusion.
Is prashn kā sahi uttar hai—Mahābhāṣyam.