The correct answer is A. Rs. 500.
The amount to be transferred to Capital Reserve Account is the difference between the amount received on reissue of shares and the amount already received on the shares. In this case, the amount received on reissue of shares is Rs. 4500 (50 shares x Rs. 90 per share). The amount already received on the shares is Rs. 1500 (50 shares x Rs. 30 allotment money + 50 shares x Rs. 20 first call money). Therefore, the amount to be transferred to Capital Reserve Account is Rs. 3000 (Rs. 4500 – Rs. 1500).
Option B is incorrect because it is the total amount received on reissue of shares.
Option C is incorrect because it is the total amount already received on the shares.
Option D is incorrect because it is the total amount received on reissue of shares plus the total amount already received on the shares.