Step 1: About Anupitaka.
Anupitaka refers to Buddhist texts that are not included in the three main Pitakas (Vinaya, Sutta, Abhidhamma).
Step 2: Identification.
Milindapañho (Questions of King Milinda) is a famous dialogue between King Menander (Milinda) and Nāgasena.
It is classified under Anupitaka because it is outside the traditional Tripiṭakas.
Step 3: Analysis of options.
- (1) Dhammapada: Belongs to Khuddaka Nikāya (Sutta Pitaka).
- (2) Milindapañho: Correct, classified under Anupitaka.
- (3) Samantapāsādikā: A Vinaya commentary, not Anupitaka.
- (4) Saddharmapuṇḍarīka: Belongs to Mahāyāna, not Anupitaka.
Step 4: Conclusion.
Thus, Milindapañho is the correct text under **Anupitaka**.