Doubt from biomolecules

Doubt : I am getting a) as answer but given answer is c. Clarify this.

Source: MS Chouhan

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@Bhuvanitha_2020 I know the trick that when two acidic groups are given and 1 basic one then we take pka of the acidic ones.
Same applies for the case when there is two basic ones and one acidic

Can I know the reason because ammonia is most basic here not the other carboxylic acid .

And then what will be the structure of zwitter ion (like which carries positive and negative charge)

Yes I checked my notes and it’s given the same(like they haven’t provided the reason)
@Shwetanshu_2018 can you clarify this?

My sir just told us that the reason is not in the syllabus. I really don't have a clue about its reason.

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