Internal Validity Is Concerned with Which of the Following

Internal validity is concerned with which of the following?

A) the representativeness of the sample test units
B) the extent that the observed relationship between the independent variable and dependent variable is generalizable to the real world
C) the measurement of extraneous variables that are internal to the experimental setting itself
D) the extent to which the change in the dependent variable was actually due to the independent variable
E) the control of the complex variables not having an effect on the independent variable

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