Q. The famous “Mitra Mela” was related to which of the following?

Answer: A
Notes:

Explanation: Savarkar and his brother organised Mitra Mela, a secret society, in 1899 which merged with Abhinav Bharat (after Mazzinni’s ‘Young Italy’) in 1904. Soon Nasik, Poona and Bombay emerged as centres of bomb manufacture.

Source: Tamil Nadu NCERT