Which of the Equation Sets Represents Coupled Reactions?
A)A $\Delta$ G = -54 Kcal/mole)and E + F --> G + H

Which of the equation sets represents coupled reactions?

A) A + B --> C + D ( $\Delta$ G = -5.4 kcal/mole) and E + F --> G + H ( $\Delta$ G = +4.4 kcal/mole)
B) A + B --> C + D ( $\Delta$ G = -5.4 kcal/mole) and C + D --> E + F ( $\Delta$ G = +4.4 kcal/mole)
C) A + B --> C + D ( $\Delta$ G = -5.4 kcal/mole) and E + F --> C + D ( $\Delta$ G = +4.4 kcal/mole)
D) all are correct examples of coupled reactions