I would agree with your answer of C. As there would need to be calcium to start with and they seem to come from the sarcoplasmic reticulum
The electrons in these bonds carry energy. Within the power plants of the cell (mitochondria), energy is used to add one molecule of inorganic phosphate (P) to a molecule of adenosine diphosphate (ADP). The amount of energy stored is about 7,300 calories for every mole of ATP formed.
Plant uses sun energy to convert the carbondiode into energy
