It's C.
All chemical reactions will always need activation energy.
Both a b c are the right answer choice for this question
Fruits, flowers, roots, and stems
You've forgotten to attach the thing you need help with.
The answer is Glycolysis. Glycolysis is the first stage of Respiration that happens in the cytoplasm of the cell. In this process, a 6-carbon sugar molecules is broken down to form 2 molecules of 3-carbon pyruvate. The process of Glycolysis generates ATP in the presence of oxygen.