Answer:
C). Cognitive behavioral.
Step-by-step explanation:
As per the given description, Petra's therapist would be considered as a 'cognitive behavioral therapist' as she attempts to identify and modify her 'distorted thoughts' and 'self-defeating beliefs' in order to help her overcome this psychological problem of 'shyness' and 'fear that she faces' while interacting with the people. Such therapists(as Petra's therapist) intends to treat the psychological disorders by evaluating the reasons for these orders(primarily the negative or pessimistic thoughts) and modifying these thoughts or beliefs to bring solutions to their problems(mental) and improve the mental health of the patient. Thus, option C is the correct answer.