The country of Mexico is about three times the size of _Texas _ and borders the Gulf of Mexico in the East and the in the West. I need to fill in the other blank but I don't know it. I don't know it pls help

Why might the spanish government have approved of the encomienda system? a the system allowed for fair treatment of all under it, leading to a happy and prosperous colony. b the system used natives as slaves which meant the government was able to maximize their profit of exported goods. c the system allowed for mostly profitable trade within the different colonies. d the system was a great example of how to successfully run a colony, making spain a world power.