The most important purpose of irrigation was to

preserve scarce water supplies.

provide transportation routes.

share water with neighboring peoples.

keep farmers from growing food surpluses.

The best answer is preserve scarce water supplies.

The objective of irrigation is associated with higher productivity, higher profitability, better product quality, and production stability. The use of irrigation is a technical option of water application that aimed mainly at the fight against drought and thus preserves the sources of water in the scarce region.

just like you man, i personally think its either c or d

explanation:

but good luck with the test man