The correct option is A Rhizopus for formation of zygospore
A pheromone is a chemical substance produced by one individual that causes behavioral changes in other organism when these are released in environment. it produces an effect on physiological, reproductive or external features. for example, Rhizopus has single sex but have two different mating types. When their adjacent halves secrete pheromones it triggers the hyphae to grow. Therefore option A "Rhizopus for formation of zygospores" is correct option