DrThick Is Observing a Troop of Baboons and Taking Regular

Dr.Thick is observing a troop of baboons and taking regular blood samples from them.The dominant male baboon Dr.Thick calls "Rafiki" has just shown a much greater increase in cortisol than any of the other males in the troop.Dr.Thick is not surprised because of something that happened about half an hour earlier.What might Dr.Thick have seen?

A) Rafiki was challenged.
B) The troop was given less food at their regular feeding that usual.
C) Lightning struck a tree in the habitat and one baboon was injured.
D) Rafiki was bullied by a group of subordinate males.