20. Which of the following statements is correct? (A) A chiral compound will always react to give a chiral product. (B) The most stable conformation of tert-butylcyclohexane is with the tert-butyI group at the axial position. (C) Aryl amines can be synthesized by reduction of nitroarenes. (D) The Diels-Alder reaction involves rearrangement of electrons between the two HOMOs of the two reactants. (E) A hard nucleophile will prefer to react with an α.β-unsaturated carbonyl compound in 1,4- addition instead of 1,2-addition.