The coral group of islands of India is option 4: Lakshadweep. Coral islands are formed by the accumulation of coral reefs. These reefs are made up of the remains of tiny marine organisms called corals, which live in warm, shallow waters. Coral reefs are typically found in tropical or subtropical regions, where the water is clear and the temperature is warm.

Andaman and Nicobar islands (options 1 and 2) are not primarily composed of coral reefs, although they do have some coral reef formations. The Andaman and Nicobar islands are primarily formed by volcanic activity.

Minicoy (option 3) is one of the islands of Lakshadweep. While it is part of the Lakshadweep group of islands, it is not the coral group of islands in India.

Lakshadweep (option 4) is the correct answer because it is a group of islands located in the Arabian Sea, off the southwestern coast of India. These islands are formed predominantly by coral reefs and are known for their pristine underwater ecosystem, diverse marine life, and beautiful coral formations.

In conclusion, the correct answer is option 4: Lakshadweep, as it represents the coral group of islands in India.