How is sunlight used in photosynthesis?
sunlight controls the amount of water in plant cells.
sunlight is a nutrient for plants.
sunlight is converted to chemical energy.
sunlight breaks cell walls to allow energy in and out.

Option B, Sunlight is converted to chemical energy

Explanation:

The energy from sunlight is used in the process of photosynthesis to convert chemical compounds like carbon dioxide and water into glucose, oxygen and ATP. Adenosine Tri Phosphate (ATP) is the major source of energy in all living organisms. ATP provides power/energy to carry out all other cellular/metabolic process with in a living organism. Also, solar energy is entrapped chemical energy in food (glucose & other sugar etc.) produced by chlorophyll containing organism such as plants, algae, cyanobacterias etc.

Thus, option B is correct  

option number one would be youre best option

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.