Concept:The pH scale measures acidity or alkalinity from 0 to 14.Explanation:A pH value of 7 is neutral.Values below 7 are acidic; the lower the value, the stronger the acidity.Values above 7 are alkaline; the higher the value, the stronger the alkalinity.A soil with pH2 is far below 7 and very close to 0.Therefore, it is extremely acidic, not just slightly or moderately acidic.Answer:Highly acidic (Option C).