The correct answer is B. Rhizopus.
Rhizopus is a genus of fungi that is commonly called bread mold. It is a type of mold that grows on bread and other moist, starchy foods. Rhizopus is a fungus that is found in soil and on decaying organic matter. It is a common cause of food spoilage. Rhizopus is a type of mold that reproduces by spores. The spores are produced in sacs called sporangia. The sporangia are located on the tips of stalks called sporangiophores. When the sporangia mature, they release the spores into the air. The spores can then land on food and germinate, forming new colonies of Rhizopus.
Puccinia is a genus of fungi that causes rust diseases in plants. Ustilago is a genus of fungi that causes smut diseases in plants. Both Puccinia and Ustilago are not commonly called as bread mold.