Question

which best describes a possible negative impact of irrigation of farmland? food can be produced in dry areas. increased runoff can pollute bodies of water. food can be produced through drought years. water can improve the livelihood of farmers.

Explanation:

We need to identify the negative impact of irrigating farmland. The first, third, and fourth options describe positive outcomes (producing food in dry areas, during droughts, and improving farmers' livelihoods). The second option, "Increased runoff can pollute bodies of water," explains a negative consequence as runoff from irrigation can carry pollutants (like fertilizers, pesticides) into water bodies, causing pollution.

Answer:

B. Increased runoff can pollute bodies of water.