A starts a business with Rs. 40,000. After 2 months, B joined him with Rs. 60,000. C joined them after some more time with Rs. 1,20,000. At the end of the year, out of a total profit of Rs. 375,000, C gets Rs. 150,000 as his share. How many months after B joined the business did C join ?

A

5 months

B

6 months

C

4 months

D

7 months