(2010. Taizhou, Zhejiang) 16. existing A, B, C three metals, respectively, and air and oxygen reaction, the phenomenon is shown in the following table: According to the above information.

This question examines the order of metal activity and its application, determine the strength of the metal activity can be used to determine the speed or intensity of the reaction of the different metals and another substance, and the same substance reacts with the phenomenon of the more intense its activity. The more violent the reaction with the same substance, the stronger the activity. By a, b, c three and the reaction of the air can know a reaction with the air and the most violent, the strongest activity; by a, b, c three and the phenomenon of oxygen reaction of c intense combustion b is still black, so the reaction of c is more violent than b some, so c's activity is stronger than b, so you can determine the activity of the three from the strongest to the weakest order is: a, c, b. Therefore, A