The beta coefficient:

A. is a standardized measure of the risk per unit of return.

B. measures the tendency of two stocks returns to move together.

C. is a metric that shows the extent to which a given stocks returns move up and down with the stock market portfolio.

D. measures that part of a securitys risk associated with random events that can be eliminated by proper diversification.

E. is a metric that shows the tendency of a given stocks returns to move up and down with government bonds.