[单选题]
Which of the following s9 +lcmu3t idy5k2i*uktatements about pH is inc :.xaz:h4t)xb tmya g)orrect?
A. pH cannot be negative
B. The pH of pure water changes with temperature
C. As the pH increases, the concentration of $H^+$ decreases
D. There is a non-linear relationship between pH and $[H^+]$