Acid A has a concentration of 0.001 M and a pH of 3. Acid B has a concentration of 0.01 M and a pH of 3.5. Which one of the following statements is true?
a. A and B are both strong acids.
b. A and B are both weak acids.
c. A is a strong acid and B is a weak acid.
d. A is a weak acid and B is a strong acid.