(Solved): A curved arrow mechanism is used here to show the interconversion between two resonance structures. ...

A curved arrow mechanism is used here to show the interconversion between two resonance structures. Identify the reason that this mechanism is wrong. A) The arrow is going to an ${\mathrm{sp}}^3$ carbon that is not part of the conjugated pi-system. B) The arrow is going from a site of high electron density to another site of high electron density. C) The arrow is going from a site of low electron density to another site of low electron density. D) The resonance arrow shows a sigma bondbreaking event.