The return of M.K Gandhi from South Africa on 9 January 1915 is celebrated each year in India as:

The correct answer is (c) The Non-Resident Indian Day
Explanation:
● 9th January is celebrated as Pravasi Bharatiya Divas (NRI Day) to mark the contribution of the overseas Indian community.
● It commemorates Mahatma Gandhi's return from South Africa to Mumbai in 1915.
Information Booster:
● The event was first established in 2003.
● It is organized by the Ministry of External Affairs.

Additional Information:
• (a) The Khadi Divas: Celebrates Mahatma Gandhi’s promotion of Khadi (hand-spun cloth) as a symbol of self-reliance and resistance to British rule.
• (b) The International Peace Day: Celebrated on September 21, established by the United Nations, promoting global peace.
• (d) The Foreign Policy Day: Not a recognized event in India related to Gandhi's return from South Africa.​