Regarding the Normal Curve and Standard Deviation, Which of the Following

Multiple Choice

Regarding the normal curve and standard deviation, which of the following statements is/are TRUE?

A) The standard deviation measures offset proportions of a normal curve that are above and below the mean.
B) The distribution of chance events typically resembles a normal curve.
C) The relationship of the standard deviation to the normal curve does not change, which makes it possible to compare groups of scores from distributions that are approximately normal.
D) All of these statements are true.