ATP, a higher-energy molecule than ADP, is synthesized from ADP in the electron transport chain. Given that molecules cannot go from a lower energy to a higher energy on their own without an extemal input of energy, how does the energy for this reaction enter the system? O A Energy enters the system when NADH and FADH, carry their high-energy electrons to the electron transport chain where, through chemiosmosis, their energy is used to transport hydrogen ions across the membrane into the intermembrane space, causing the buildup of a charge difference. B. Energy enters the system when NAD* and FAD carry their high-energy electrons to glycolysis, where, through kinesis, their energy is used to transport acetyl-CoA across the membrane into the intermembrane space, causing the buildup of a charge difference. 0 C. Energy enters the system when NADH and FADH, carry their high-energy electrons to the Calvin cycle where, through chemiosmosis, their energy is used to transport hydrogen ions across the membrane into the intermembrane space, causing a higher concentration of hydrogen ions. D. Energy enters the system when NAD' and FAD carry their high-energy electrons to the electron transport chain where, through chemiosmosis, their energy is used to transport hydrogen ions across the membrane into the matrix, causing the buildup of lactic acid.​