Skin color would be a good indicator...
They help regulate the levels of blood glucose, or sugar, in your body.
Your answer would be A, because skeletal muscles are your muscles that allow your bones and joints to move. Answer A is an example of your involuntary muscles, which are not the same as skeletal muscles. I hope you still have time to put the correct answer down on your test, but if not please make me the brainliest answer, because my answer is actually correct.
May be batteries because we need battery for our torch light which may be helpful during emergency