Need answers asap!! How were the Inca able to grow crops in the Andes mountains?

a
They built irrigation canals and terraces.
b
They used the rivers to water their crops.
c
They created floating gardens.
d
They used the land in the valleys.

A — They built irrigation Canals and Terraces. Their cisterns and canals snaked and angled around the mountains, They cut terraces into the hillsides getting progressively steeper up the slopes of the mountains to water their crops. You can see pictures of these online!