When a Hydronium Ion Concentration Equals 1 × 10^-4 Moles

Multiple Choice

When a hydronium ion concentration equals 1 × 10^-4 moles per liter, what is the pH of the solution? Is the solution acidic or basic?

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