4.0 moles of methanol is allowed to react with 1.0 moles of benzoic acid to form methyl benzoate and water. After the mixture reaches equilibrium 0.10 moles of benzoic acid is recovered. What is the numerical value of the equilibrium constant?
a. 2.0
b. 2.1
c. 2.6
d. 2.8
e. 3.0