The answer is the first one , nos preocupan
<span>the question like this is called assumptions, but the assumptions have to be proved by experiments and prove to be the best, but generally in science, theories might change from time to time, so in science, it is necessary to prove the hypothesis, not just by putting up the theories.
hope this helps </span>
The answer would be A) Intensity. Because, You are pushing your body to get in all the training it needs in a short amount of time by intensifying the workout.