The ratio of the lengths of the second and the fourth fingers, denoted 2d:4d, is an indicator of the level of prenatal testosterone. In a small-scale study, 84 male students completed two questionnaires measuring sociable and aggressive dominance, along with 2d:4d measurements. What did the study conclude?
a) Significant correlation between 2d:4d and aggressive dominance
b) Significant correlation between 2d:4d and social dominance
c) No correlation between 2d:4d and aggressive dominance
d) No correlation between 2d:4d and social dominance