The differences in D and L forms of sugars are based on:

• A. spatial arrangement of carbon atom to which the functional group is attached.
• B. configuration of H and OH groups around the penultimate carbon.
• C. if the plane of polarised light is rotated to left (levo), it is L form; and if shifted to right (dextro), it is D form.
• D. special arrangement of H and OH groups at the last carbon atom.