Which of the following liquids Dumas method can be used to determine its molar mass?

Phenol, boiling point $=182C$

Benzene, boiling point $=80C$

Formic acid, boiling point $=101C$

Methanol, boiling point $=65C$

a$)$ Methanol and Formic acid.

b$)$ Benzene, Phenol, and methanol.

c$)$ Formic acid and benzene.

d$)$ Benzene and methanol.