The answer according to me is c as east mean right side part of the country which is Andaman and nicobar

The correct answer is option 'A': Lakshadweep Islands.

Here is an explanation of why the Lakshadweep Islands lie to the southeast of the mainland:

Lakshadweep Islands:
- The Lakshadweep Islands are a group of islands located in the Arabian Sea.
- This archipelago consists of 36 islands and islets, with only 10 of them being inhabited.
- The islands are situated about 200 to 440 kilometers off the southwestern coast of India.
- Geographically, the Lakshadweep Islands are located between 8° and 12° North latitudes and 71° and 74° East longitudes.
- The islands are known for their scenic beauty, coral reefs, and pristine beaches.

Andaman and Nicobar Islands:
- The Andaman and Nicobar Islands are a group of islands located in the Bay of Bengal.
- They are situated to the southeast of the mainland.
- The Andaman Islands lie between 6° and 14° North latitudes and 92° and 94° East longitudes.
- The Nicobar Islands lie between 6° and 10° North latitudes and 92° and 94° East longitudes.
- The Andaman and Nicobar Islands are known for their rich biodiversity, tropical rainforests, and indigenous tribes.

Sri Lanka Island:
- Sri Lanka, formerly known as Ceylon, is an island country located in the Indian Ocean.
- It is situated to the south of the Indian subcontinent.
- Sri Lanka lies between 5° and 10° North latitudes and 79° and 82° East longitudes.
- The island is known for its cultural heritage, ancient ruins, and beautiful landscapes.

Conclusion:
Out of the given options, only the Lakshadweep Islands lie to the southeast of the mainland. The Andaman and Nicobar Islands are located to the southeast of the mainland but are not included in the options. Sri Lanka, on the other hand, lies to the south of the mainland.