An investigation was undertaken to determine if there was a relationship between the percentage of coronary artery blockage and cholesterol levels in obese Caucasian males undergoing cardiac catheterization during the January of 2015. The results indicate a strong positive correlation, r = .88, p = .001. What statistical test would you suspect was used to analyze these data?

A. Repeated measure ANOVA

B. The correct answer is not listed among the choices given here

C. Independent t-test, also called the Student's t-test

D. Mann-Whitney U test