The Student Room Group

a question about respiration

hi friends, I am confusing with this question below:

Which process uses the greatest amount of energy?
A gaseous diffusion
B protein synthesis
C respiration
D starch digestion

the correct answer is B, but I wonder why D is incorrect? how would I know synthesis require energy higher than digestion? or I just need to remember it as a common knowledge?
and what if the options change to "starch synthesis" and "protein digestion"? which one is correct now?

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