The correct answer is B. Rs. 60.
The amount transferred to capital reserve is the difference between the amount received on re-issue and the amount originally received on allotment and call. In this case, the amount received on re-issue is Rs. 8 x 30 = Rs. 240. The amount originally received is Rs. 3 x 30 + Rs. 4 x 30 = Rs. 180. Therefore, the amount transferred to capital reserve is Rs. 240 – Rs. 180 = Rs. 60.
Option A is incorrect because it is the total amount of the forfeited shares. Option C is incorrect because it is the amount received on re-issue of the shares. Option D is incorrect because it is the total amount received on allotment and call.