Mole fraction of solute is 0.2 in solution then lowering in V.P $\bigtriangleup P = 10$. If lowering in V.P. $\bigtriangleup P = 20$ then mole fraction of solvent will be in solution :

Question

( A ) 0.6
( B ) 0.2
( C ) 0.4
( D ) 0.8