What Is the Maximum Amount of Work That Can Be $\leftrightarrow$

What is the maximum amount of work that can be done by the reaction
CH₄(g) + 2O₂(g) $\leftrightarrow$ CO₂(g) + 2H₂O(g)
Given $$\begin{array}{l}\text { Substance }\\\begin{array} { c c } & \Delta G _ { \mathrm { f } } ^ { \circ } \\& ( \mathbf { k J } / \mathbf { m o l } ) \\\mathrm { CH } _ { 4 } ( g ) & 50.8 \\\mathrm { CO } _ { 2 } ( g ) & 394.4 \\\mathrm { H } _ { 2 } \mathrm { O } ( g ) & - 228.57\end{array}\end{array}$$

A) -50.8 kJ/mol
B) -751 kJ/mol
C) +113 kJ/mol
D) -115 kJ/mol
E) -807 kJ/mol