Question

19. To what does the term Brahmacharya refer?

(A) Non-violent resistance
(B) The Hindu Scriptures
(C) The voluntary refusal of sexual relations by Hindu men
(D) The British rule over India

Answer 1

From options, It is C. but its meaning is not limited to that. 
You have to do it voluntarily and willingly. You should not even think about sex. 

Answer 2

the correct answer is option C.
brahmacharya refers to the voluntary refusal of sexual relations by hindu men..