The soil with the highest water-holding capacity in the triangle must be a soil that has a very high percentage of clay soil.
The question is incomplete but I will try to help you the much I can. There are different kinds of soil such as;
The water holding capacity of the various kinds of soil are different. The soil with the least water holding capacity is sandy soil while the soil with the greatest water holding capacity is clay soil.
Hence, the soil with the highest water-holding capacity in the triangle must be a soil that has a very high percentage of clay soil.
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