Answer : 1. "Sac formation"
Explanation :

Answer: A) Sac formation Explanation: Ascomycota is a division or phylum of the kingdom Fungi that, together with the Basidiomycota, form the subkingdom Dikarya. Its members are commonly known as the sac fungi or ascomycetes.    Hence, Sac formation is a characteristic of the Ascomycota fungi.