Which of These Statements Is True

Which of these statements is true?

A) Gamma-aminobutyric acid has been shown to be a key neurotransmitter involved in anxiety (Ray, 2018) .
B) Anxiety conditions are associated with dysfunction in the serotoninergic system, a neurotransmitter system involving serotonin in the amygdala (Pelligrino, Pierce, & Walkup, 2011) .
C) Anxiety conditions are associated and with impairment in the noradrenergic system, a neurotransmitter system involving norepinephrine in the locus coeruleus (Pelligrino, Pierce, & Walkup, 2011) .
D) all of the above