Chloroform and acetone form a non-ideal solution, in which A . . . .B type interaction are more than A . . . . . A and B . . . .B type interaction due to H-bonding. Hence, the solution shows, negative deviation from Raoultâ€™s Law i.e.,

$\Delta V_{mix}=$-ve

$\Delta H_{mix}=$-ve

Total volume of solution = less than (30 + 50 ml) or < 80 ml

Hence (B) is the correct answer.