Which of the following is most likely to act as a base rather than a nucleophile?

Name: Which of the following is most likely to act as a base rather than a nucleophile?
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Question

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The molecule with a lone pair of electrons and a readily available proton nearby is more likely to act as a base. In this case, option C has a nitrogen with a lone pair of electrons, which can readily accept a proton to form a stable ammonium cation. The other options have molecules that are more likely to act as nucleophiles.

Which of the Following Is Most Likely to Act as a Base