How does an underestimate relate to rounding factors before estimating?

Under the feudal system, which of the following did lords grant to their vassals?

Which of the following led to a continuation of the treatment in the excerpt above? a)the brutality of the trans-atlantic african slave trade. b)spanish repression after violent native uprisings in new spain during the 16th century. c)european competition to quickly establish colonial holdings in the new world. d)the reliance of the spanish on native americans to provide labor under the encomienda system.

So far, the only person to serve as governor of two different states