The Barren island is situated in the _______

Correct option is A

The correct answer is (a) Andaman Sea.
 Barren Island is located in the Andaman Sea and is part of the Andaman and Nicobar Islands, a Union Territory of India. It is particularly notable for being the site of the only confirmed active volcano in South Asia. The volcano on Barren Island first erupted in 1787 and has had several eruptions since then, the most recent ones occurring in the 21st century.
 The island, as its name suggests, is largely uninhabitable due to volcanic activity. The environment around the island is barren, mostly consisting of the volcano and its immediate surroundings. The volcanic eruptions have shaped the landscape, and despite the harsh conditions, the island is an important geographical feature and a point of interest for scientific research.
 Barren Island being located in the Andaman Sea places it to the east of the Indian mainland, and it is geographically closer to Myanmar than to the Indian peninsula. The location in the Andaman Sea makes it strategically significant and also contributes to its unique ecological system, which has adapted to the volcanic nature of the island.
 Therefore, the correct answer is (a) Andaman Sea.