Question

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

Explanation:

A hypothesis should be a test - able prediction related to the question. The first option includes multiple factors not just light intensity. The second option is too absolute. The fourth option is too general. The third option provides a specific, test - able prediction about how light intensity (by changing distance) affects photosynthesis rate.

Answer:

If the distance between the source of light and the plant is increased, the rate of photosynthesis will decrease.