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Upon prolonged heating, the endo Diels-Alder adduct shown below undergoes isomerization to form the exo adduct.

Which one of these statements about these compounds is NOT true?

(A) The exo adduct is more stable than the endo adduct.

(B) The endo adduct is formed under conditions of kinetic control.

(C) The interconversion of exo and endo adducts shows the reversibility of the DielsAlder reaction.

(D) The exo and endo adducts are diastereomers.

(E) The pure endo enantiomer shown yields the pure exo enantiomer shown when they interconvert.