Question

1. which agricultural technique was essential for the incas?

○ hydroponics
● irrigation
○ crop rotation
○ terracing

Explanation:

The Incas used terracing to farm on steep mountain slopes, creating flat areas for cultivation. Hydroponics is modern, irrigation is about water supply (though they used it too, but terracing was key for their mountainous terrain), and crop rotation was not their essential technique. Terracing was vital to make arable land in the Andes.

Answer:

D. Terracing