Which of the Following Is True About Statistical Regression

Which of the following is true about statistical regression?

A) Extreme high scores are more likely to regress to the mean than are extreme low scores.
B) Researchers should not conduct research on people with extreme scores on a measure.
C) Adding a pretest is the best way to control for the problem of statistical regression.
D) Adding a control group allows the researcher to test whether statistical regression has occurred.