Final answer:
The most accurate statement regarding the first stage of photosynthesis is that radiant energy is converted into chemical energy, and this is a light-dependent stage.
Step-by-step explanation:
The first stage of photosynthesis is the light-dependent reactions, where radiant energy from sunlight is converted into chemical energy. This process takes place in the chlorophyll-containing pigments of photosynthetic membranes. The energy is absorbed by the pigments and then transferred to the reaction center, where it is used to pump hydrogen ions and build up a high concentration of ions.
These ions flow through ATP synthase to form molecules of ATP, which will later be used in the light-independent reactions to assemble sugar molecules.