The correct answer is option 'A', the 10 Channel separates the Andaman from the Nicobar Islands. Let's delve into the details to understand this further.

Andaman and Nicobar Islands:
The Andaman and Nicobar Islands are a group of islands located in the eastern part of the Bay of Bengal. They are a union territory of India and are known for their rich biodiversity, pristine beaches, and indigenous tribes.

- Andaman Islands: The Andaman Islands are located to the north of the archipelago and consist of a group of islands, including the Great Andaman and Little Andaman. Port Blair, the capital of the Andaman and Nicobar Islands, is situated in the Andaman Islands.

- Nicobar Islands: The Nicobar Islands lie to the south of the Andaman Islands and are separated from them by several water bodies.

10 Channel:
The 10 Channel is one of the water bodies that separate the Andaman Islands from the Nicobar Islands. It is located between the southernmost tip of the Great Andaman and the northernmost tip of the Little Nicobar.

- Location: The 10 Channel is situated between 9°25'N latitude and 92°10'E longitude. It is approximately 145 kilometers wide at its widest point.

- Importance: The 10 Channel is an important navigational route for ships traveling between the Andaman Sea and the Bay of Bengal. It provides a passage for maritime trade and transportation between the Andaman Islands and mainland India.

Other Channels and Water Bodies:
Apart from the 10 Channel, there are other channels and water bodies that separate the Andaman and Nicobar Islands. Some of them include:

- 9 Channel: This channel lies to the north of the 10 Channel and separates the Great Andaman from the Little Andaman.

- Duncan Passage: The Duncan Passage is located to the south of the 10 Channel and separates the Little Nicobar from the Great Nicobar.

- Andaman Sea: The Andaman Sea is a large body of water located to the east of the Andaman Islands. It is part of the northeastern Indian Ocean and is bordered by Myanmar and Thailand.

Conclusion:
In conclusion, the 10 Channel is the water body that separates the Andaman Islands from the Nicobar Islands. It plays a crucial role in maritime transportation and trade between these two island groups.