Which of the Following Statements About Sigmatropic Reactions Is True $\pi$

Which of the following statements about sigmatropic reactions is true?

A) The reactants contain one more $\pi$ bond than the product.
B) The product contains one more $\pi$ bond than the reactant.
C) A $\pi$ bond is broken in the reactant.
D) A $\sigma$ bond is broken in the reactant.