During the light-independent reactions of photosynthesis, carbon dioxide is combined with hydrogen to form sugars. what is the energy source, if any, that allows this process to occur?

Hello. This question is incomplete. The full question is:

"During the light-independent reactions of photosynthesis, carbon dioxide is combined with hydrogen to form sugars. What is the energy source, if any, that allows this process to occur?  A.The energy source is high-energy bonds in sugar molecules.  B. The energy source is ATP from the light-dependent reactions.  C. The energy source is ATP from processes that occur in other organelles of the cell.  D. No energy source is used; the process occurs without an energy input."

B. The energy source is ATP from the light-dependent reactions.

Explanation:

Independent light reactions occur in the chloroplast stroma. During this phase, glucose will be formed from CO2. Thus, while the light phase provides energy, in the dark phase carbon fixation takes place. The energy used in this phase is provided by ATP and during this phase, carbon fixation, the production of organic compounds and the regeneration of ribulose diphosphate occur.