please help

or each resonance structure, use curved arrows to show the delocalization of electron pairs that transforms the structure into indicated resonance structure. Do not delete any pre-drawn bonds, charges, or lone pairs. If you accidentally delete a vital part of the structure, use the undo button on the lower left of the drawing camvas. 1. Draw curved arrows to form structure B. 2. Draw curved arrows to form structure C. 3. Draw curved arrows to form structure D