Answer:A is the answer
Explanation:Hope you get it right
The first and last sounds most reasonable, but I will go with the last one.
<span>The question is asking how over-irrigation is damaging to soil. Over-irrigation means that too much water is being delivered to the soil, and too much water can wash some other important ingredients out - such as organic material. Therefore, the correct answer is:
a. It reduces the amount of organic material in soil.</span>