Identify the correct date on which Non-Resident Indian (NRI) Day, also known as Pravasi Bharatiya Divas, is observed:

The correct answer is 9th January.

Step-by-Step Explanation:

1. Significance of Pravasi Bharatiya Divas (NRI Day):
Pravasi Bharatiya Divas (Non-Resident Indian Day) is celebrated in India to mark the contribution of the overseas Indian community towards the development of India.

2. Historical Background:
On 9th January 1915, Mahatma Gandhi returned to India from South Africa. He went on to lead India's freedom struggle and changed the lives of Indians forever. To commemorate his return, 9th January was chosen as the date for Pravasi Bharatiya Divas.

3. Observance:
The event has been observed annually since 2003, and since 2015, it has been celebrated as a biennial event sponsored by the Ministry of External Affairs of the Government of India.

Therefore, Non-Resident Indian (NRI) Day is observed on 9th January.