Research That Attempted to Establish a Relationship Between Hormonal Levels

Research that attempted to establish a relationship between hormonal levels and sexual orientation

A) has determined that the hormonal surge during puberty is of critical importance in establishing heterosexuality.
B) has found that men with lower levels of testosterone are more likely to be gay than men with higher testosterone levels.
C) has found a relationship for men but not for women.
D) has failed to find any simple, straightforward relationship.