What Is the Primary Limitation of the Correlation Coefficient

Multiple Choice

What is the primary limitation of the correlation coefficient?

A) It is not appropriate if the variables are related in a linear fashion.
B) It cannot be used to establish causal relations between two variables.
C) It can be used to establish the direction of a relation between two variables but not the strength.
D) It can only be used if the data are measured on a nominal or ordinal scale.