The correct option is A Spore
Rhizopus is a genus of common saprophytic fungi of plants and specialized parasites on animals. They reproduce by forming asexual and sexual spores. In asexual reproduction, Sporangiospores are produced inside a spherical structure, the sporangium. When sporangium gets burst and spill out spore, they germinate into the young one in favourable condition.
Thus, the correct answer is option A.