Answer: c) as a therapist
Explanation:
Doctoral degree in psychological field is pursued by individual to become a Doctor of psychology (PsyD). He/she can develop clinical activities through practicing in clinic.This degree educates a person about treatment of patients through therapy including emotion and mind, counselling a person, serving patient etc.
According to the question,Petra can pursue in the clinical field as a therapist, that is highest percentage in doctoral field of psychology.
Other options are incorrect because business professional ,government official and professor in an institute are not the job positions that are achieved through psychological doctoral degree.Thus, the correct option is option(c).