The correct answer is: B. Fungus X is a common mold, and fungus Y is a chytrid.
A mold is a fungus that grows in the form of multicellular filaments called hyphae which form a network known as a mycelium. This group of fungi is important in biotechnology and food science (for example production of foods, beverages, antibiotics, pharmaceuticals and enzymes).
Chytrid ("little pot") refers to group of fungi with chitin cell walls, a posterior flagellum and absorptive nutrition. They reproduce with zoospores (motile asexual spores).
