Which of the following is an example of fungi?

Fungi are a diverse group of organisms that belong to their own kingdom, distinct from plants, animals, and bacteria. They are characterized by their mode of nutrition, which involves absorbing organic material from their environment, and by their cell walls made of chitin.

Mushrooms represent the fruiting bodies of certain fungi and are often the most recognizable form. They play key roles in ecosystems as decomposers, breaking down organic matter and recycling nutrients back into the soil.

Yeasts, which are unicellular fungi, are crucial in various biological processes, including fermentation. They are widely used in baking and brewing due to their ability to convert sugars into alcohol and carbon dioxide, thus contributing to food production and energy cycling.

Mold, which is typically a term applied to filamentous fungi, can be found in various environments and is important both ecologically and commercially. It is often involved in decomposition and can also have industrial applications.

Since all three—mushrooms, yeast, and mold—are valid examples of fungi, the inclusion of all of them leads to a comprehensive understanding of the diversity within the fungal kingdom. Thus, the choice that encompasses all of these examples is the correct answer.