PLEASE HELP What is the independent variable in the following testable question? Does changing the height of a ramp affect how far a car will travel?

Question 1 options:

the type of car

height of the ramp

how far the car will travel

the type of material the ramp is made out of

You want to lose weight and have been trying to decide which type of fad diet is best for you. you ask your doctor, who responds that a. fad diets are a temporary fix but generally don't have any side effects b. fad diets can be used several times a year to maintain a healthy weight c. fad diets can be risky for your health and, in the long run, do not work d. fad diets should never be used one right after the other; there should be a break between them select the best answer from the choices provided. a b c d