When a Hydronium Ion Concentration Equals 1 × $10 ^ { - 10 }$

When a hydronium ion concentration equals 1 × $10 ^ { - 10 }$ moles per liter,what is the pH of the solution? Is the solution acidic or basic?

A) The pH of this solution is 4,which is acidic.
B) The pH of this solution is 8,which is basic.
C) The pH of this solution is 6,which is acidic.
D) The pH of this solution is 10,which is basic.