Which statement, if a woman exercises 25 minutes each day, according to physical activity recommendations, is true?

The correct answer would be D, It depends upon the woman's level of activity.

Normally 20 to 30 minutes on daily exercise is enough for people to stay healthy and fit. But it is totally dependent upon the level of physical activity a person is doing. If a person's lifestyle is sedentary, which means he is not doing enough physical activities, then he should increase the time to exercise. Similarly if a person's lifestyle include more physical activity like standing job, then 20 to 30 mins exercise is more than enough for him to stay fit.  

Explanation:

these are common warning signs of overtraining syndrome:

washed-out feeling, tired, drained, lack of energy

mild leg soreness, general aches, and pains

pain in muscles and joints

sudden drop in performance

insomnia

headaches

decreased immunity (increased number of colds, and sore throats)

decrease in training capacity/intensity

moodiness and irritability

depression

loss of enthusiasm for the sport

decreased appetite

increased incidence of injuries.

a compulsive need to exercise