Which of the following statements about the pH scale is true? A. Bases, which have higher concentrations of hydronium ions than acids, are found from 14 and down to 7. B. Acids, which have lower concentrations of hydronium ions than bases, are found from 14 and down to 7. C. Bases, which have higher concentrations of hydronium ions than acids, are found from 0 and up to 7. D. Acids, which have higher concentrations of hydronium ions than bases, are found from 0 and up to 7.