The correct option is A Saccharomyces cerevisiae
Saccharomyces cerevisiae is a commonly used species of yeast used in the beverage industries for the production of alcohol.
Torulopsis utilis is a species of yeast that is used as a flavouring agent in processed foods and pet foods.
Clostridium botulinum produces a toxin, which causes the disease botulism; however, it is also used commercially, in medicine, cosmetics and research.