Answer:
A) light strikes the chloroplast
Step-by-step explanation:
The process of photosynthesis completes in two stages. First is the light- dependent stage known as light reactions and second stage is the light-independent stage, called dark reactions. Light reactions require light and it takes place in thylakoids of the chloroplast. Light reactions begins when light strikes chloroplast and coverts solar energy into ATP and reduced NADPH.