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.
Answer:
you either have a good or bad trip , when i did it my walls , the tress , the grass was moving like waves. Music was better and i was just happy the whole time. Your eyes/pupil will open up so you will look crazy high. Don't do it if your parents are around. Effects supposly last 12 hours but the times i did it , it would only last me 2-5 hours. i must have had some weak stuff but i did hallucinate and they where all amazing trips
Explanation:
The answer for this would be FASTER. Compared to the past, the rates of soil erosion at present is faster. This is due to the increasing activities of humans that affected the quality of the soil. For example, deforestation. Because people have been occupying space now, they had to cut more trees and this contributes to soil erosion. Hope this helps.