Answer:
C. Ph.D
Step-by-step explanation:
PhD is the highest degree that everyone could achieve in any field of study. In order to obtain it, people have to prove their capability in their field by expanding the field of knowledge though original research. Because of the assumption that a person has to dedicate his/her life into one specific topic to obtain a PhD, Someone who obtain this title tend to be seen as more favorable in research and clinical works.