Which of the following statements about correlation is (are) true?

I. Correlation is a measure of the relationship between two series of numbers.

II. Coefficients of correlation range from a maximum of +10 to a minimum of -10.

III. Negatively correlated assets reduce risk more than positively correlated assets.

IV. If there is no relationship between the rates of return of two assets over time, these assets are negatively correlated.

A.

II, III and IV only

B.

I only

C.

I, II, III and IV

D.

I and III only