One difference between D-glucose and L-glucose is
a. the open-chain form of L-glucose does not exist.
b. it is not possible to make L-glucose.
c. L-glucose has a 5-membered ring and D-glucose has a 6-membered ring.
d. only D-glucose is found in disaccharides and polysaccharides.
e. L-glucose cannot form a closed structure.