Fructose Is Different from Glucose and Galactose Because

Multiple Choice

Fructose is different from glucose and galactose because

A) fructose is a pentose; the other sugars are hexoses.
B) fructose is a ketose; the other sugars are aldoses.
C) the cyclic form is a square; the other sugars display hexagons.
D) fructose doesn't have an open form; the other sugars do have an open form.