The study of fungi is called mycology, which is the correct answer in this case. Mycology is a branch of biology that focuses on the scientific study of fungi, including their classification, structure, genetics, and ecological roles. Fungi are a diverse group of organisms that play important roles in various ecosystems, as well as being important in industries such as medicine, agriculture, and food production. The study of fungi is important for understanding their ecological relationships, their impact on human health, and their potential for use in various applications. Therefore, option 1, mycology, is the correct choice.