Which of These Statements Concerning PH Is Incorrect

Which of these statements concerning pH is incorrect ?

A) pH is based on the [H₃O⁺] in solution.
B) If [H₃O⁺] = 1.0 × 10 ^{− 4}, the solution is acidic.
C) If pH = 7.0 then the solution is neutral.
D) If the pH
E) Pure water has [H₃O⁺] = 1.0 × 10^-7 M.