Answer:
A. water cannot be used to irrigate one crop because it is used for another
Step-by-step explanation:
In agriculture, the term shortage is used to describe a condition when the farm does not have the capacity to fulfill the needs for All crops in their field. Even if only one type of crops couldn't get the water, it will be considered as a shortage.
Most shortage situations is caused by climate and cannot necessarily controlled by the farmers . (For example, period when rain rarely fall and reduce the amount of water in lake/rivers)