The correct answer is:
d. photosynthesis converts radiant energy to chemical energy to be used by organisms in the food chain.
Photosynthesis is the process by which plants, algae, and some bacteria convert light energy (radiant energy) from the sun into chemical energy in the form of glucose. This stored energy is then available to be consumed by other organisms in the food chain, making photosynthesis a fundamental process in the flow of energy through ecosystems.