A) Both lines represent endergonic reactions. B) The dashed line represents a reaction that includes an enzyme and a cofactor.

A) 

Both lines represent endergonic reactions.

B) 

The dashed line represents a reaction that includes an enzyme and a cofactor.

C) 

The solid line represents a reaction that has been catalyzed by an enzyme.

D) 

The energy of the products is higher than the energy of the reactants.