Determine the field capacity, when the unit weight of water is 9.8 KN/m3, and volume of water stored in unit area of soil is 28 m3, the dry unit weight of soil is 18 KN/m3, and the depth of root zone of the plant is 7 m.

• A. 2.178 m²
• B. 2.135 m²
• C. 2.125 m²
• D. 2.25 m²