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.