The correct answer is; Variables.
Further Explanation:
During a study, when a person changes their behavior or characteristics this is called a variable. These can change in a small way or a huge way. Events can change during a study and this can cause the study to go in a different direction than previously imagined.
When researching anything, a variable is a set of two or more things that are related or has a relationship with each other. The variables are then examined by the researchers to find out if they are correlated or only associated. Variables are very important to all types of research.
Learn more about research studies at https://brainly.com/question/38853273
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