Below Is the Open-Chain Form of Fructose, Followed by Several

Multiple Choice

Below is the open-chain form of fructose, followed by several cyclic monosaccharides. Choose the cyclic monosaccharides that are the ring form of fructose.

A) Only structure II is d-fructose.
B) Only structure III is d-fructose.
C) Both structures I and II are d-fructose.
D) Both structure III and IV are d-fructose.
E) All of these structures are d-fructose.