Which of the Following Statements Is Not True Concerning Enzymatic

Which of the following statements is not true concerning enzymatic activity?

A) Each enzyme has a preferred pH at which the enzyme reaction rate is highest.
B) Above a certain temperature,an enzyme will become denatured.
C) As the temperature increases,most enzymatic reactions will still proceed at the same rate.
D) Enzymatic reactions proceed quite rapidly.
E) Enzyme activity increases as substrate concentration increases until the maximum rate is achieved.