The best way to use physical activity to assist with weight control is to:
a. begin a high-intensity exercise program to "jump-start" energy expenditure.
b. work on strength-building activities with short duration and many repetitions.
c. walk for 30 minutes twice a week.
d. exercise daily in conjunction with a substantial calorie reduction.

The correct answer is d. exercise daily in conjunction with a substantial calorie reduction.

Explanation:

Doing daily exercise is beneficial for everyone to remain fit and to prevent becoming overweight. By doing exercise we burn extra energy that our body has in the form of fats so when we do exercise these fat molecule burns and do not get accumulated in our body.

Therefore intake of extra calory is responsible for gaining weight so the best way to reduce weight is doing daily exercise in conjunction with a reduction in calory intake in the body.

It will result in a calory deficit in the body which is necessary for reduction of weight of the body so the right answer is d.

i think your answer is c. measurement system in which the medication dosage was calculated.