The answer choice which represents that which would not contain a carboxylic acid as in the task content is; Choice E; Sweat.
Which answer choice would not contain a carboxylic acid?
It is noteworthy to know that the weak acid, Carboxylic acid is a food-grade acid which is present in most acidic food substances which ranges from fruits to other food substances.
Hence, it follows from the answer choices contained in the task that; only Choice E is that which would not contain carboxylic acid.
Read more on carboxylic acid in fruits;
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