If the pH of a solution is increased from pH 5 to pH 7, it means that the

a. concentration of H+ is twice (2X) what it was at pH 5.

b. concentration of H+ is one-half (1/2) what it was at pH 5.

c. concentration of OH- is 100 times greater than what it was at pH 5.

d. concentration of H+ is 100 times greater and the concentration of OH- is one-hundredth what they were at pH 5.