C. Divine theory
Or more specifically, the divine-right theory (since the divine theory only establishes that an action's morality and rightness is derived from god, whereas the divine right theory argues that a king is given the right to rule by a god).
I want to say entrepreneurship, but there's also free economy enterprise, so... I'm gonna go with entrepreneurship.
The government outlawed slavery in 1981 and made it a crime in 2007. Estimates of the percentage of slaves vary from 10% to 20% of Mauritanian population.