Answer:
Option B arrangement of atoms
Step-by-step explanation:
Both Glucose and fructose are monosaccharides which share the same molecular formula of C6H12O6. The molecular formula reveals that they contain six carbons. However Glucose and fructose have different ring structure. Fructose possesses five member ring structure whereas glucose possesses six member ring. The structural difference leads to the phenomena that some enzymes with specific shape of active site will only accept either fructose or glucose.