Answer:
Ascomycota.
Explanation:
Fungi are multicellular eukaryotes that includes different organism like yeast and moulds. Fungi can be classified on the basis of their spore formation.
The ascomycota division of fungi produce spores in the sac or bag like structure called ascus. The morels are included in the ascomycota and they also have the ability to form cup-like structure with the sac-like structure.
Thus, the correct answer is option (b).