Chose all that apply for spring tides

Which is the best hypothesis for the scientific question "how does light intensity affect the rate of photosynthesis"? a) light intensity, co2 concentration, and temperature are factors that determine the rate of photosynthesis.b) light intensity has no effect on the rate of photosynthesis.c) if the distance between the source of light and the plant is increased, the rate of photosynthesis will decrease.d) light intensity has an impact on the rate of photosynthesis.