The vapour pressure of acetone at a certain temperature is 480 mm of Hg. A non- volatile, non- electrolyte solid weighing 0.2 g when added to 5.8 g of acetone, the vapour pressure of the solution becomes 470 mm of Hg. The molar mass of the solute is

Options

A. 170 g/mol
B. 94 g/mol
C. 188 g/mol
D. 72 g/mol