Question

Which was the main way the Incas modified their environment to grow more food?

OA by building stone walls
OB by building terraces
C. by cutting down forests
D. by irrigating fields

Answer 1

They developed resilient breeds of crops such as potatoes, quinoa and corn. They built cisterns and irrigation canals that snaked and angled down and around the mountains. And they cut terraces into the hillsides, progressively steeper, from the valleys up the slopes

This is from google. I hope this is what you were looking for.