You chose to account for whether study participants had a healthydiet and a regular exercise routine. These factors that can reduce confidence in your results are known as:A. correlational variables. B. experimental variables. C. unfounded variables. D. confounding variables.

Confounding variables

Explanation:

A confounding variable is simply referred to as an outside influence which can bring about alterations to the dependent and the independent variable such that the result of the experiment research is influenced.

Therefore, the factors that can reduce confidence in your results are known as confounding variables. They can bring about useless results and also ruin a research.

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