The best sentence that describes a covariate is A variable that shares some of the variance of another variable in which the researcher is interested. The correct option is option B.
What is Covariate?
A covariate is a variable that is related to both the independent variable(s) and the dependent variable, and it shares some of the variance with the variable of interest. It is used to control for potential confounding factors or to assess the relationship between the independent and dependent variables while accounting for the influence of the covariate.
Variable of Interest
The variable of interest refers to the specific variable that researchers are primarily interested in studying or investigating in a research study or experiment. It is the main focus of the study and the variable that researchers aim to understand, explain, or predict.