Which of the Following Statements About the Mechanism of the Diels-Alder

Multiple Choice

Which of the following statements about the mechanism of the Diels-Alder reaction is true?

A) Three π bonds break; two σ bonds and one π bond form.
B) Three π bonds break; one σ bond and two π bonds form.
C) Two π bonds break; one σ bond and one π bond form.
D) Two π bonds break; two σ bonds and one π bond form.