Which of the following statements correctly differentiates ketoses from aldoses?

• A. Ketoses contain the carbonyl group on the first carbon atom, while aldoses have the carbonyl group on the second carbon atom.
• B. Ketoses have an internal carbonyl group, and aldoses have a terminal carbonyl group.
• C. Ketoses are complex sugars with a ketone group, while aldoses are simple sugars with an aldehyde group.
• D. All of the above.

Answer: (B)