A double decked bus can accommodate 100 passengers 40 in the upoer deack and 60 in the lower deck . In how many ways can a group of 100 passengers be accommodated is 15 refuse to sit in the lower deck and 20 refuse to sit in the upper deck ?

Options

A. `(100!)/(60!40!)`
B. `(100!)/(30!35!)`
C. `(65!)/(25!40!)`
D. `(65!)/(35!45!)`

Answer

C