Research Animals Freed from Their Captive Situations Face Challenges for All

Research animals freed from their captive situations face challenges for all of the following common reasons except:​

A) ​Many are infected with diseases because of their use in medical experiments.
B) ​Many have been socially damaged because of living in intense isolation.
C) ​Many have been abused and neglected and have no social skills.
D) ​Many have become so human that they no longer want to live with their species.