Although the glycolytic degradation of glucose is a major source of energy, other dietary carbohydrates, such as galactose and fructose, are also important fuels. When being metabolized, fructose and galactose

a) are metabolized by conversion to intermediates in the glycolytic pathway.

b) cannot be degraded by steps in the glycolytic pathway.

c) can be used to form pyruvate by metabolic pathways that run parallel to glycolysis.

d) must first be converted to glucose to be used as fuel.