Define "aldose" and "ketone" and recognize them structurally

Explanation:

Aldose is monosaccharide sugar in which the carbon backbone chain has carbonyl group on endmost carbon atom which corresponds to an aldehyde, and the hydroxyl groups are connected to all other carbon atoms.

Example - Glucose

Ketone is functional group with structure RC(=O)R', where the groups, R and R' can be variety of the carbon-containing substituents.

Example, Ethylmethylketone

Structurally, Aldose can be recognized by observing the carbonyl group on endmost carbon atom which corresponds to an aldehyde in a sugar.

Structurally, Ketone can be recognized by observing the functional group with structure RC(=O)R'.

the answer to your question is c

it's all four options.