What did the Aztecs do to increase the acreage of land they could use for farming? A. They land-filled Lake Texcoco B. All of the above C. They leased unused land from the neighboring tribes
D. They built stepped pyramids and grew crops on each layer

I’m pretty sure it’s 4, you can check on the calculator

One of the things that allowed native americans in mexico to settle cities larger than those in areas to the north was "b. the development of cities that were built by an earlier civilizations," since mexico had been the home of some of the world's most advanced civilizations before the columbian invasion

The answer is a. : ) ; )