Which of the Following Statements About an Electrocyclic Ring-Opening Reaction $\pi$

Which of the following statements about an electrocyclic ring-opening reaction is not true?

A) An electrocyclic ring-opening reaction is an intramolecular reaction.
B) An electrocyclic ring-opening reaction requires a source of energy (heat or light) .
C) The product of an electrocyclic ring-opening reaction contains one fewer $\pi$ bond than the reactant.
D) The product of an electrocyclic ring-opening reaction contains one more $\pi$ bond than the reactant.