Answer: B, pernicious - despot
Step-by-step explanation:
In each possible answer, the second part isn't as important for now.
The first part is important. Adroit means clever or skillful, which can fit. Efficacious means efficient, and Pernicious means damaging or harmful. All of these fit.
Now, for the second part. Libertarian is iffy, anarchist is plausible, but despot is the most convincing since despot means a cruel tyrant, which matches with out presumed plot, that something cruel happened and the peasants are mistreated.