The correct answer is option D, Minicoy. Minicoy is the southernmost island among the Lakshadweep islands.

Here is a detailed explanation:

- **Lakshadweep Islands**: Lakshadweep is a group of islands located in the Arabian Sea. It is an archipelago consisting of 36 islands, out of which only 10 are inhabited. These islands are known for their pristine beaches, coral reefs, and marine biodiversity.

- **Geographical Location**: Lakshadweep is situated off the southwestern coast of India. It is located between 8° and 12° North latitude and 71° and 74° East longitude. The islands are about 200 to 440 km away from the Kerala coast.

- **Minicoy**: Among the Lakshadweep islands, Minicoy is the southernmost island. It is located at a latitude of approximately 8° 17' North and a longitude of around 73° 3' East. Minicoy is the second-largest island in the Lakshadweep archipelago.

- **Bitra**: Bitra is one of the smallest islands in the Lakshadweep group and is located towards the northern part of the archipelago. It is situated at a latitude of about 11° 36' North and a longitude of approximately 72° 12' East.

- **Kavaratti**: Kavaratti is the capital of Lakshadweep and one of the most developed islands in the archipelago. It is located at a latitude of around 10° 33' North and a longitude of about 72° 38' East. Kavaratti is not the southernmost island among the Lakshadweep group.

- **Amini**: Amini is another inhabited island in Lakshadweep, but it is not the southernmost. It is located at a latitude of approximately 11° 6' North and a longitude of around 72° 45' East.

In conclusion, among the given options, Minicoy is the southernmost of the Lakshadweep islands. It is known for its beautiful beaches, lagoons, and traditional culture.