Step 1: Entomophthorales is an order of fungi well known for containing insect-pathogenic (entomopathogenic) species that infect and kill insects.
Step 2: In the influential classification by Alexopoulos and Mims (1979), this order was placed within the class Zygomycetes, alongside orders like Mucorales, based on shared features such as zygospore formation and coenocytic hyphae.
Step 3: Ascomycetes, Oomycetes and Myxomycetes are distinct fungal or fungus-like groups with their own characteristic reproductive structures, none of which is where Entomophthorales was classically placed.
Step 4: So the correct answer is Zygomycetes.