Answer :
The correct answer is D.
In a controlled experiment you have two variables: independent and dependent.
The independent variable is what you're changing, and the dependent variable is the result you get. The dependent variable "depends" on what you make the independent variable.
In a controlled experiment you have two variables: independent and dependent.
The independent variable is what you're changing, and the dependent variable is the result you get. The dependent variable "depends" on what you make the independent variable.
Answer:
The results of changing the independent variable are observed
Explanation: