The correct answer is D. Both A and B.
Glycogen and fat are both reserve foods of fungi, but starch is not. Starch is a type of carbohydrate that is found in plants. It is made up of glucose molecules that are linked together in long chains. Fungi do not have chloroplasts, so they cannot produce their own food through photosynthesis. Instead, they must obtain their food from other sources, such as dead or decaying organic matter. Fungi can break down starch into glucose, which they can then use for energy. However, they do not store starch as a reserve food. Instead, they store glycogen and fat. Glycogen is a type of carbohydrate that is similar to starch, but it is more branched. This makes it easier for fungi to break down and use for energy. Fat is a type of lipid that is also used by fungi as a reserve food. It is a more efficient form of energy storage than glycogen.
In conclusion, the correct answer is D. Both A and B.