According to the pH scale, which is used to determine if a place or solution is either acidic or basic, and the scale does that by measuring the amount of H+ or OH-, with a large amount of H+ the soil will be acidic, which means that the pH will be low. If the pH is below 7, it is considered to be acidic, if it is above 7, it is considered to be basic. If the soil is acidic, a good idea to counter-balance it, it's adding a strong base, like Lime, which mostly consists of Calcium hydroxide. Therefore the answer is Acid, Lime, letter A