100 mL NH3 and NaOH at pH=11, which need more acid to neutralize?, homework help

Acid is added to two different base solutions to neutralize these solutions: 100 mL NH3 (aq) at pH=11 and 100 mL NaOH (aq) at pH=11. How do you expect the pH will change?

a. The NH3 solution requires less acid to neutralize

b. The NH3 solution requires more acid to neutralize

c. Both solutions require the same amount