Maddie Is 4 Years Old

Maddie is 4 years old. She was abandoned by her mother at the age of 1 year and has been in and out of foster homes since that time. The longest she has been in one foster home is about 6 months. Her current foster parents have expressed concern because she will go up to random adult strangers and start talking to them and has even started following them when they end the conversation and leave the environment. Which stress-related disorder does this best describe?

A) Posttraumatic stress disorder
B) Disinhibited social engagement disorder
C) Reactive attachment disorder
D) Adjustment disorder