A.I. Explanation:

Option 1: "interfere with the irrigation of land"

Explanation: This option suggests that excess water absorption interferes with irrigation, but the text does not mention any negative impact on irrigation itself. Instead, it focuses on how excess water contributes to soil salinization, which is a different issue.

Option 2: "limit the evaporation of water"

Explanation: This option implies that excess water absorption limits evaporation, which contradicts the text. The text states that excess water leads to evaporation, leaving salts behind, rather than limiting it.

Option 3: "require more absorption of air by the soil"

Explanation: This option suggests a need for more air absorption by the soil, which is not supported by the text. The text discusses how excess water leads to salinization, not air absorption.

Option 4: "bring salts to the surface"

Explanation: This option is correct as it directly relates to the text, which explains that excess water from irrigation can raise the water table, bringing dissolved salts to the surface. This process is a key factor in desertification as it creates a crust that prevents air and water from reaching the soil.