Benzene and toluene form nearly ideal solutions. At $$20^\circ$$C, the vapour pressure of benzene is $$75$$ torr and that of toluene is $$22$$ torr. The partial vapour pressure of benzene at $$20^\circ$$C for a solution containing $$78$$ g of benzene and $$46$$ g of toluene in torr is

A

$$50$$

B

$$25$$

C

$$37.5$$

D

$$53.5$$