Which of the Following Statements Is Not True

Multiple Choice

Which of the following statements is not true?

A) Extraneous variables refer to outside variables that are not part of the experiment.
B) Persons or objects receiving a treatment are said to be in an experimental group.
C) Persons or objects not exposed to a treatment are said to be in a control group.
D) Internal validity refers to whether the treatment really made the difference in the measurements obtained.
E) All of these are true.