Step 1: Master Da's Identity.
Surya Sen, a prominent freedom fighter from Bengal, was popularly known as Master Da. He played a key role in the Chittagong Armoury Raid and was an active participant in the Indian independence movement.
Step 2: Analysis of options.
- (A) Subhash Chandra Bose: Subhash Chandra Bose was not known as Master Da.
- (B) Surya Sen: Surya Sen, also known as Master Da, was a key figure in India's freedom struggle.
- (C) Chittaranjan Das: Chittaranjan Das, another prominent freedom fighter, was not called Master Da.
- (D) Bipin Chandra Pal: Bipin Chandra Pal was not known as Master Da either.
Step 3: Conclusion.
Surya Sen was known by the nickname Master Da, so the correct answer is (B) Surya Sen.