Duncan Passage separates:-
[B] Andaman and Nicobar
[C] North and South Andaman
[D] South andaman and little Andaman
Duncan pass is located between South and little Andaman. Duncan Passage is a strait in the Indian Ocean. It is about 48 km (30 mi) wide; it separates Rutland Island (part of Great Andaman) to the north, and Little Andaman to the south.