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.

What was the main reason for building the suez canal? a. increasing russian naval ports in the middle east b. allowing indian merchants to reach the eastern coast of africa c. increasing european trade with the middle east and asia d. allowing the french military to bring weapons to asia