Which of these statements about photosynthesis is correct?

a. both photosynthesis and respiration require the same amount of energy for metabolic processes, such as synthesis and the breakdown of carbohydrates.

b. photosynthesis releases energy for metabolism, whereas respiration requires energy for the breakdown of carbohydrates.

c. photosynthesis requires energy for the synthesis of carbohydrates, whereas respiration releases energy during the breakdown of carbohydrates.