Which of the Following Best Describes the Meaning of "Variable

Multiple Choice

Which of the following best describes the meaning of "variable confounding"? ​

A) A variable is confounding if it complicates the researcher's analysis .
B) A variable is confounding if it influences the data.
C) Two variables are confounded if their effects on the response variable cannot be distinguished.
D) A variable is confounding if it influences other variables.
E) A variable is confounding when it has no influence over the data.