HOW SHOULD THESE EXERCISES BE CARRIED OUT

48. - BAI TAP TRAC NGHIEM TIENG ANH 12
BAI TAP TRAC NGHIEM TIENG ANH 12
48. How should these exercises be carried out? A. with pauses, taking 10 breaths between each one B. continuously for two or three minutes C. steadily and slowly, breathing evenly D. as energetically as possible