Which of the following statements accurately describes the inca economy?
a. the incas had a market economy in which individuals traded goods and used currency.
b. the incas had a centrally-planned economy centered around the mita.
c. the inca economy was based on a complex system of sharecropping.
d. the incas used slave labor for agriculture and free incas for manufacturing.

b. The Incas had a centrally-planned economy centered around the mita.

Explanation:

The Inca economy system was based on group work within an ayllu, the economy center. The entire society had to work in order to provide for the community. For the Incas, this was equal to paying their taxes.

Tax work was referred to as the mita, and every citizen had to do whatever the society needed from them such as road building or working the fields. In return they wouldn't have to fear for their basic needs - they would all be met and for free (food, clothes, medical help etc.).

b. the passage of the equal rights amendment  

explanation:

this mean that anything that someone else could do they could do