Which of These Equations Demonstrates Energetic Coupling in a Cell

Multiple Choice

Which of these equations demonstrates energetic coupling in a cell? Equation 1: ATP + H₂O  ADP + P_i
G₁ = -7 kcal/mol
Equation 2: phosphoenolpyruvate + H₂O  pyruvate + P_i
G₂ = -14.8 kcal/mol
Equation 3: glucose + P_i  glucose-6-phosphate + H₂O
G₃ = +3.3 kcal/mol
Equation 4: ADP + P_i  ATP + H₂O
G₃ = +7 kcal/mol

A) equations 1 and 2
B) equations 2 and 3
C) equations 3 and 4
D) equations 1 and 4
E) equations 1 and 3