In Order for a Pearson's R to Reflect a Meaningful

Multiple Choice

In order for a Pearson's r to reflect a meaningful relationship, which of the following must be true?

A) the relationship must be nonlinear
B) the variables must be measured on at least an ordinal scale
C) the range of scores must be restricted on at least one of the variables
D) the variables must be measured on either an interval or a ratio scale