Answer:
d. Light energy to chemical energy
Explanation:
This is because photosynthesis converts light energy into chemical energy in the form of sugars or other carbon compounds.
The other options are not correct because they do not match the actual steps of photosynthesis. Chemical energy to light energy is the reverse of what happens in photosynthesis. Light energy to electrical energy and electrical energy to light energy are not involved in photosynthesis at all.