How Did the Spanish and Inca Mita Systems Differ

How did the Spanish and Inca mita systems differ?

A) Spain relied on convicts as laborers; the Incans used all available workers.
B) Incans required that all adult males work in the mines for one year of every seven, no matter what hardship it may have caused for their families.
C) Incans refused to exempt any men from participating in the mita system.
D) Spain required that all males spend one year out of every seven working in the mines at low wages.
E) Spain granted allowed some men to opt out of the mita system if it would create an economic hardship for their families.