Answer:
d. Lean Mass
Step-by-step explanation:
With the practice of exercise and a well-balanced diet, what usually happens is an increase in lean mass, associated with the loss of body fat.
This gain of lean mass mainly with people who practice resistance and strength exercises, such as weight training and Crossfit.
The bodyweight remains unchanged, even if the individual's body measurements change. That is since muscle mass weighs more than fat mass, with less volume.
The attached image shows the difference in volume for the same muscle weight (lean mass) and fat.