Answer: B)
Explanation:
Nasir's behavior can be diagnosed as generalized anxiety because of the feelings that he is having and those are chills, palpitations, feeling of losing control and more.
If he had post-traumatic stress, panic or phobic disorder those feelings would be represented in a situation that is triggering him and reminding him of some past event but the anxiety is showing sometimes for no reason when the body became used to them.