i believe it is C , well it's cuz after the person stops , ur depth of breathing is still deep cuz u have oxygen debt
got it ?
True, but y cant it be B, cause if u think abt it, after exercise, it takes some time for the breathing to get steady to get to Oxygen debt. and then tht straight line is the time during oxygen debt and then it slowly gets back to normal..
This too can be true ryte?