Amixed-market economy is one in which

both the government control and the private sector exist

Explanation:

The mixed-market economies are economies that have primarily developed from the command economies, but have implemented market economy elements as well. In this type of economies we have a situation where the governments still have a very important role in the economy, while in the same time, the private businesses are also thriving. The government is usually in control of the most important and abundant natural resources, thus providing security for the country's people and economy. The private businesses are able to operate freely, and they collaborate with the government as a business partner., with both of them being dependent on each other.

the answer is d) it provided irrigation for farming.

i would have to say its c