题目

It was Mother’s day morning last year and I was doing my shopping at our local supermarket with my five-year-old son, Tenyson. As we were leaving, we found that only minutes earlier an elderly woman had fallen over at the entrance and had hit her head on the concrete. Her husband was with her, but there was blood everywhere and the woman was embarrassed and clearly in shock. Walking towards the scene, Tenyson became very upset about what had happened to the couple. He said to me, “Mum, its not much fun falling over in front of everyone.”     At the front of the supermarket a c下列反应中，电子转移方向和数目正确的是（ ）A.B.C.D.