The correct answer is C. Furrow method.
The furrow method is the most commonly adopted method of irrigation for cereal crops. It is a simple and efficient method that can be used on a variety of crops. The water is applied to the crop in furrows, which are channels that are dug between the rows of plants. The water flows down the furrows and wets the soil around the roots of the plants.
The furrow method is a good choice for cereal crops because it is relatively easy to control the amount of water that is applied. The depth of the furrows can be adjusted to control the amount of water that reaches the roots of the plants. The furrow method is also a good choice for crops that are planted in rows, such as corn and wheat.
The other options are not as commonly used for cereal crops. The free flowing method is a simple method that involves allowing water to flow freely over the surface of the soil. This method is not very efficient, as much of the water is lost to evaporation and runoff. The check method is a more efficient method that involves using dams to create small pools of water. The water is then allowed to flow slowly from one pool to the next. This method is more efficient than the free flowing method, but it is still not as efficient as the furrow method. The sprinkling method is a very efficient method that involves spraying water over the surface of the soil. This method is often used for crops that are planted in close rows, such as vegetables. However, the sprinkling method can be expensive to operate, and it can also damage the leaves of some plants.