The Focus on Neuroscience Box "Emotions and the Brain" Describes

The Focus on Neuroscience box "Emotions and the Brain" describes a PET scan study by researcher Antonio Damasio and his colleagues. The study found that when participants recalled an emotionally charged memory:

A) internal brain changes occurred after the participant reported subjectively feeling the emotion.
B) there was an increase in brain levels of the neurotransmitter neuropeptide Y.
C) there was an increase in brain levels of the neurotransmitter cholecystokinin.
D) internal brain changes occurred before the participant reported subjectively feeling the emotion.