The reduction of $$O_2$$ to $$H_2O$$ in acidic solution, $$O_2 (g) + 4H^+ (aq) + 4e^- \rightarrow 2H_2O (l)$$, has a standard reduction potential of 1.23 V. If the pH of the acid solution is increased by one unit, half cell potential will

A

decrease by 59 mV

B

increase by 59 mV

C

decrease by 236 mV

D

increase by 236 mV