Step 1: Buddhaghoṣa.
He was a 5th-century CE Pali scholar, famous for writing the commentaries (Aṭṭakathās) and the great treatise Visuddhimagga.
Step 2: Nāgasena.
Nāgasena authored the Milindapañho, not Madhyamika kārikā.
Step 3: Nāgārjuna.
Nāgārjuna authored the Madhyamika kārikā, not Milindapañho.
Step 4: Conclusion.
Correct statements are (A) and (B) only.