Sonja Used to Work Out Five Days a Week When

Sonja used to work out five days a week when she was in her late teens.In her twenties,she worked out three days a week.Now she is in her forties,and she only seems to work out when she has the time.Sonja's pattern of behavior illustrates the idea that

A) many health-impairing habits creep up on us
B) many health-impairing habits involve activities that are quite pleasant at the time
C) the risks associated with health-impairing habits tend to lie in the distant future
D) people often underestimate the risks associated with their own health-impairing behaviors