Which of the following is a zoospore producing class of fungi?

Answer: Option A

Oomycetes are a zoospore-producing class of fungi.
Oomycete zoospores are single nucleated and wall-less cells that can swim with the help of two flagella; one tinsel (or anterior) flagellum, and one whiplash (or posterior) flagellum.
Zoospores are produced by Blastocladiomycota, Chytridiomycota, Neocallimastigomycota, and diverse zoosporic fungi of the uncertain taxonomic assignment included in the Cryptomycota.