5 g of oven dried soil was heated in a furnace for 24 hours. After cooling, it weighed 4.8 g. What is the amount of humus in the soil?

• A 40.0g per 100 g dry soil
• B 4.4g per 100g dry soil
• C 4.0 g per 100g dry soil
• D 0.4g per 100g dry soil