Which of the following statements is true of chemistry involved in aggression?

A) Chemicals do not trigger aggressive behaviors in humans.
B) Testosterone appears to affect the tendencies to dominate and control other people.
C) In humans, chemistry is involved in aggression, especially in the form of thyroxin.
D) Men have less testosterone levels than women do.

Studies have shown that testosterone affects the tendencies to dominate and control others, which can sometimes manifest as aggression. This does not mean that testosterone triggers aggressive behaviors in all individuals, but it can contribute to certain aggressive behaviors, particularly in males. Choice A is incorrect as chemicals, including hormones like testosterone, can play a role in aggressive behaviors. Choice C is incorrect as thyroxin is not typically associated with aggression, but rather with metabolism and energy levels. Choice D is incorrect as men typically have higher testosterone levels than women.