I'd say D. expert power because expert power is when an employee ( or in your case the teacher) has a high set of knowledge/skills that other employees do not posses. Which by the information above about this teacher's PhD and thier experience, I assume that this teacher must have expert power.
But nobody really knows exactly when Jesus was born. Some scholars think that he was born between 6 B.C. and 4 B.C., based partly on the biblical story of Herod the Great
