“the leader of our research team has studied this issue for 10 years. she earned a phd from harvard university and has, since then, been a world leader in her field” this statement reflects power. a. leadership b. referent c. coercive d. expert

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.

Yes, the correct answer is b.

Ibelieve that is true! but go with your gut.good luck!