Which of These Statements Is True

Which of these statements is true?

A) Generally, individuals with panic disorder without agoraphobia have milder symptoms than do individuals with agoraphobia (Wolfe, 2005) .
B) With respect to receptors, the amygdala and cingulate gyrus of individuals with panic have been found to have decreased 8-HG_2A density (Greene, Bailey, & Neumeister, 2013; Nash et al., 2008; Neumeister et al., 2004;) .
C) Whereas some proponents of biological theories attribute panic disorder to unusual epinephrine deactivation in the pons, others propose that neurotransmitters are implicated in the development of panic disorder (Comer, 2015; Redmond, 1977, 1981) .
D) all of the above