Final answer:
A weak acid can be neutralized by a strong base through a neutralization reaction that results in the formation of salt and water, leading to a solution with a pH closer to seven. The option (D) is correct.
Step-by-step explanation:
A weak acid can be neutralized by a strong base. Neutralization is the reaction between an acid and a base, producing salt and water. In this context, neutralization leads to a solution with a pH that is closer to seven. A strong base will effectively ionize in water and react with the weak acid to form the salt and water, thus neutralizing it.
However, a weak base will not be as effective in neutralizing a weak acid as the two substances would partially ionize, and a weak acid obviously cannot neutralize itself. A strong acid is not the correct answer either, as adding a strong acid to a weak acid will not result in neutralization but will instead make the solution more acidic. Therefore, option (D) is correct.