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(D) In the titration of a strong acid $(HCl)$ with a strong base $(NaOH)$,the initial $pH$ is very low due to the presence of $HCl$. As the base is ad

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(D) In the titration of a strong acid $(HCl)$ with a strong base $(NaOH)$,the initial $pH$ is very low due to the presence of $HCl$. As the base is added,the $pH$ increases slowly at first. Near the equivalence point,there is a sharp and sudden increase in $pH$ because the concentration of $H^+$ ions decreases rapidly. After the equivalence point,the $pH$ becomes almost constant as it is determined by the excess of $NaOH$ added. Graph $D$ correctly represents this characteristic sigmoidal curve for a strong acid-strong base titration.

Which of the following plots represents the graph of $pH$ against the volume of alkali added in the titration of $NaOH$ and $HCl$?

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