A 0300 G Sample of Caffeine Was Dissolved in 10 $\circ$

A 0.300 g sample of caffeine was dissolved in 10.0 g of camphor (K_f = 39.7 ^$\circ$ C/m) ,decreasing the freezing point of camphor by 3.07 ^$\circ$ C.What is the molar mass of caffeine?

A) 47.0 g/mol
B) 194 g/mol
C) 388 g/mol
D) 94.0 g/mol
E) 97.0 g/mol