TBR: pH change and neutrality

[lazyindy]

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In TBR organic chemistry part 1 chapter 1 passage 13, question 86:

The question states "the nucleophilicity of each reagent in aqueous solution":

a) decreases as the pH is increased
b) is best when the species is a cation
c) is best when the species is neutral
d) depends only on the size

the answer is C but I don't understand from the graphs how increasing the pH would lead to the nucleophiles becoming neutral?

 

[BerkReviewTeach]

Some compounds, such as amines, become neutral at high pH. The graph shows that the best nucleophile of the choices is an amine, which goes from its cationic conjugate acid state to its neutral conjugate base state as the pH is increased.

 

[ahisma]

Thanks for your response. But I'm still not sure how you are supposed to figure amine when the questions says "for each reagent." Aren't the other reagents listed in the passage (C9H18O & C13H24S) better nucleophiles when negatively charged?