Who among the following were associated with eradication of untouchability?

Who among the following were associated with eradication of untouchability?
1. K. Ranga Rao
2. Vitthal Ramji Shinde
3. Gopal Krishna Gokhale
4. Gangu Ram
Choose the correct answer from the codes given below —
Codes:
(A) 1, 2 and 3
(B) 1, 2 and 4
(C) 2 and 3
(D) 1, 3 and 4

Ans. (B)