965 Grams of an Unknown Substance Were Diluted with Water

96.5 grams of an unknown substance were diluted with water in a 1.000 L volumetric flask. It was determined that the concentration of the substance was 1.22 M. What is the molar mass of the unknown substance?

A) 117 g·mol^-1
B) 79.1 g·mol^-1
C) 1.26´10^-2 g·mol^-1
D) 65.4 g·mol^-1