The Equilibrium Constant for the Autonionization of Water (Shown Below)increases

Multiple Choice

The equilibrium constant for the autonionization of water (shown below) increases with increasing temperature,from 1.01 x10^-14 at 25°C to 5.31 x10^-14 at 50°C.
H₂O(l) + H₂O(l)
H₃O⁺(aq) + OH^-(aq)
Which of the following statements is consistent with this behaviour?

A) The autoionization of water is an endothermic reaction.
B) The autoionization of water is an exothermic reaction.
C) The hydronium ion concentration at equilibrium increases with increasing temperature.
D) The hydronium ion concentration at equilibrium decreases with increasing temperature.
E) Both A and C.