For regions under deteriorated environment, their environmental management may experience the following 4 special points in order of

A、Descentpoint,separationpoint,culminationpoint,recoverypoint;
B、Separationpoint,descentpoint,culminationpoint,recoverypoint;
C、Separationpoint,recoverypoint,culminationpoint,descentpoint;
D、Separationpoint,culminationpoint,descentpoint,recoverypoint