Answer:
For this one It's a bit complicated but If i had To take a Assumption i would assume B.
Explanation:
After I searching up a few Things for More information on the topic It only Left Me With B.
The answer is B.50% of American adults do not exercise ima. regular basis.
I believe the answer is circuit training never that many intervals very continuous and it can entail various types of training, cardio and strength workouts being two of them