​In laboratory experiments, the comparative rates of blood pressure reactivity for Asian Americans vs. European Americans has what relationship to rates of cardiovascular disease (CVD) for these ethnic groups?

A) ​A relationship between these two variables is not reliably identified.
B) ​An inverse relationship exists; i.e., as one rises, the other goes down.
C) ​A positive correlation exists, i.e. reactivity corresponds to CVD rate.
D) ​A relationship only exists for people who already have hypertension.

The question states that the experiment measured rates of blood pressure reactivity for two ethnic groups, and asks about the relationship to rates of cardiovascular disease (CVD). The answer can be inferred from research studies that suggest that higher rates of blood pressure reactivity are associated with higher rates of CVD. Since the question only considers two ethnic groups, it can be assumed that there is no reliable relationship between the variables for other ethnic groups. Therefore, the best answer is option C, which states that a positive correlation exists between rates of blood pressure reactivity and rates of CVD for these two ethnic groups.