Under Cellular Conditions (37°C), What Is the Actual Free Energy $\leftrightarrow$

Under cellular conditions (37°C) , what is the actual free energy for the reaction shown below when the ratio of glucose-6-phosphate to fructose-6-phosphate is 0.8:0.2? glucose-6-phosphate $\leftrightarrow$ fructose-6-phosphate $\Delta$ G'° = 1.7 kJ/mol

A) 1730 kJ/mol
B) 1870 KJ/mol
C) 1.73 kJ/mol
D) -1.73 kJ/mol
E) -1.87 kJ/mol