The correct answer is C) Remains same

When the daylight hours are increased, the rate of photosynthesis remains unchanged. Generally, if the plant gets 10 to 20 hours of light per day, it will be beneficial for photosynthesis.

1. Photosynthesis is a multi-step process that requires sunlight, carbon dioxide, and water to produce sugar and oxygen as a waste product. However, the duration of light does not affect the rate of photosynthesis.
2. The major fundamental problem of exposure to elevated light intensities arises from differences in the rates of energy absorption and transfer to the reaction centers.
3. In order to obtain an increase in serum 25OHD level similar to natural increases, subjects with body mass indexes (BMIs) above the normal range must be exposed to more light.
4. Therefore, increasing daylight hours does not increase the rate of photosynthesis.

So therefore the correct answer is C) Remains same