A, B and C enter into a partnership in the ratio 7272 : 4343 : 6565. After 4 months, A increases his share 50%. If the total profit at the end of one year be Rs. 21,600, then B's share in the profit is:

• A. Rs. 2100
• B. Rs. 2400
• C. Rs. 3600
• D. Rs. 4000