Reducing sugars are those that have

A free aldehyde group

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A free keto group

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OH group at one end

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Free aldehyde and keto group

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Solution

The correct option is C Free aldehyde and keto group
Reducing sugars are those that can reduce ions due to the presence of free aldehyde and ketone groups. All monosaccharides are reducing sugar as they are they have OH group attached to their anomeric carbon. It forms the brick red precipitate with Benedict's reagent. It has the capacity to reduce copper ions of Benedict's reagent. For example, maltose.
So, the correct answer is option D.

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