A beaker contains 100 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing?

A) The concentration of Na⁺ ion rises.
B) The concentration of Cl⁻ ion will be 0.1 M.
C) The concentration of undissociated H₂O molecules remains unchanged.
D) The pH of the beaker's contents will be neutral.
E) The pH of the beaker's contents falls.