Photosynthetic reactions are catalyzed by special proteins called enzymes. The graph below shows the rate of photosynthesis in a typical plant from -5°C to 60°C.

photosynthetic reactions vs temperature
Which of the following statements best describes the relationship between temperature and the rate of enzyme-catalyzed photosynthetic reactions?

A.
The optimum temperatures for photosynthetic reactions are -5°C and 60°C.
B.
Temperature has no effect on the rate of photosynthetic reactions.
C.
Photosynthetic reactions occur most efficiently within a certain temperature range.
D.
The rate of photosynthetic reactions increases with increasing temperature.