Using equipment that you haven't been trained on is OK as long as you're careful and read the directions. Correct answer: B You should be always careful when working out with any equipment. However, when the equipment is new and you are not used to it you should pay more attention and follow the instructions.
These substances are metabolized by the liver. Stimulants elevate the mood, depressants slower down the activity of the brain, and body. Once they are taken inside the body, they reach the specific target organs, act at the site, and the debris is metabolized by the liver and thrown out.
I'm going to say B because the other answers just don't seem to make sense.