Which statement best describes the behavior of a strong acid such as $HCl$ in water when calculating pH?

• A. It does not change $\left[H_{+}\right]$ because strong acids are neutral in water.
• B. It completely dissociates, so $\left[H_{+}\right]$ is approximately equal to the initial acid concentration.
• C. It partially dissociates, so an equilibrium expression with $K_a$ must be used to find pH.
• D. It produces $\left[O_{H^{-}}\right]$ directly, increasing pH above 7.

Answer: (B)