If a solution has a pH of 7,this means that

A)there are no H⁺ ions in the water.
B)this is a solution of pure water.
C)the concentration of H⁺ ions in the water equals the concentration of OH⁻ ions in the water.
D)this is a solution of pure water, and the concentration of H⁺ ions in the water is 10⁻⁷ M.
E)this is a solution of pure water, and the concentration of H⁺ ions equals the concentration of OH⁻ ions in the water.