Twenty different statistics students are randomly selected. For each of them, their body temperature (C) is measured and their head circumference (cm) is measured. If it is found that r0, does that indicate that there is no association between these two variables? Choose the correct answer below. A. No, because while there is no linear correlation, there may be a relationship that is not linear. B. Yes, because if r0, the variables are completely unrelated. C. No, because r does not measure the strength of the relationship, only its direction. D. No, because if r0, the variables are in a perfect linear relationship.