38. Which of the following dienes would undergo a Diels-Alder reaction?
(A) 3-methylenecyclohexene
(B) 3-methyl-1,4-cyclohexadiene
(C) 2-methyl-1,3-cyclohexadiene
(D) 1,4-cyclohexadiene
(E) 4-methylenecyclohexene

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