In this reaction _____.
[The figure shows a scheme of a chemical reaction. The reactants are two molecules, one of which consists of A and B, the other - of C and D. The products are two molecules, one of which consists of A and C, the other - of B and D. The potential energy of molecules AB and CD is higher than the potential energy of molecules AC and BD.]
a. the products have been rearranged to form reactants
b. AC is a reactant
c. CD is a product
d. the products have less potential energy than the reactants
e. entropy has decreased