Which of the Following Statements Is True

Which of the following statements is true?

A) Walking,bowling and playing golf are forms of vigorous-intensity physical activity.
B) For engaging in moderate physical activity,the target heart rate zone should be 25 to 50% of a person's age-related maximum heart rate.
C) Low-intensity,unstructured physical activities include rapid walking,lunges,and squats.
D) Aerobic exercise involves rhythmic,sustained contractions of large muscle groups.