Concept:The loss in weight after burning represents the organic matter in the soil.Explanation:Organic matter is burned off, so its mass equals the difference between the soil weights before and after burning.Loss in weight = weight before burning − weight after burning= 50 g−28 g=22 gPercentage of organic matter = weight before burningloss in weight×100%= 50 g22 g×100%=44%Answer:The percentage of organic matter in the soil is 44%, i.e. Option D.