Siamese cats have dark fur on their face, ears, legs and tail. On the core of their bodies they have lighter colored fur. The color of the fur is determined by an enzyme. On the cooler parts of the body the enzyme causes darker fur. On the warmer parts of the body the enzyme does not function.

Which of the following best explains the relationship between temperature and this enzyme?
A. The enzyme functions best in high temperatures.
B. The enzyme functions in a specific temperature range.
C. The enzyme is denatured in cold temperatures.
D. Cool temperatures allow the enzyme to break down dark pigments.