As preschoolers, the children born to the women who were diagnosed with both ptsd and depression following the september 11, 2001, attacks on the world trade center showed evidence of higher reactivity to stimuli and more aggressive behavior than did children of terrorism-exposed mothers who did not develop these disorders. what is the likely source? a. operant conditioning that rewarded such behaviors among these familiesb. the inhibition of serotonin and dopamine during brain developmentc. learned behaviors based on the observation of ptsd symptoms in othersd. the ability of cortisol and other stress hormones to cross the placenta