A
Akash Anand Good work, but this question is meant for Class-11 :)
Aditya Agarwal oh okay.
T=2a+2g...(1)
T'=2g-2a...(2)
T+2a=T'+2g...(3)
where T' is d tension between B and C and T is d tension between A and B
Solving we get a=g/3
Putting in eq. (2) we get T' to be 4g/3
A