A scientist observes that a plant grows faster in red light than in blue light. What is a suitable hypothesis for this observation?

All plants grow faster in red light due to increased photosynthesis compared to blue light.

Red light is more natural for plants and leads to greater photosynthesis than blue light.

Plants prefer red light over blue light, resulting in a higher rate of photosynthesis.

Red light increases the rate of photosynthesis in plants compared to blue light.