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Answer (D) is correct . The coefficient of correlation (r) measures the strength of the linear relationship between the dependent and independent variables. The magnitude of r is independent of the scales of measurement of x and y. The coefficient lies between –1.0 and +1.0. A value of zero indicates no linear relationship between the x and y variables. A value of +1.0 indicates a perfectly direct relationship, and a value of –1.0 indicates a perfectly inverse relationship.

Answer (A) is incorrect because The coefficient is negative if the relationship between the variables is inverse.
Answer (B) is incorrect because The coefficient relates the two variables to each other.
Answer (C) is incorrect because The size of the coefficient varies between –1.0 and +1.0.