Answer:
d. Truffles produce an odor that mammals can detect and find attractive.
Explanation:
Truffles are produced by ascomycete fungus. Truffles are ectomycorrhizal fungi and are usually found in close association with tree roots.
The spores are dispersed through fungivores, that is animals that eat fungi. These fungi have highly ecological roles in nutrient recycling and drought tolerance.
Some of the truffle species are used as food to prepare cuisines in some countries such as France, Italy, Spain and Croatia, etc.
Truffles can be harvested from natural habitats or cultivated fungiculturally.