Answer:
The independent variable is what the experimenter changes and the dependent variable is the variable that changes in accordance to what is done to the independent variable.
So, the right answer is the second one.
Explanation:
For example, if you were testing plant growth according to how much water was added, the volume of water added would be the independent variable and the rate of plant growth would be the dependent variable since how much water you add will affect how much the plant grows.
