Greg Walks into a Convenience Store with a Gun

Multiple Choice

Greg walks into a convenience store with a gun.He points the gun at the cashier and demands that she empties the money from the register into his bag.During the robbery,Greg is calm and collected.Once he gets the money,he calmly walks out of the store.Greg's ability to stay calm is the result of:

A) low levels of testosterone in his body.
B) high levels of estrogen in his body.
C) low levels of cortisol in his body.
D) high levels of serotonin in his body.