Concept:Clay soil is made of very fine particles with many tiny pores, so it holds and moves water strongly upward.Explanation:Clay has high total porosity because of the numerous small pore spaces between its particles.These small pores create a large surface area for water attraction.This leads to high capillarity, meaning water rises easily through the soil.So, clay soil possesses both high porosity and high capillarity.Answer:B. high porosity and high capillarity