Which solution has the highest pH?

• A. 50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq)
• B. 50.0 mL 0.0500 M sodium hydroxide, NaOH (aq)
• C. 50.0 mL 0.0500 M nitric acid, HNO3 (aq)
• D. 50.0 mL 0.0500 M nitrous acid, HNO2 (aq)