The correct option is A Clostridium butylicum - lactic acid
The bacterium Clostridium acetylbutylicum, easliy converts any fermentable sugar to butanol and additionally produces hydrogen gas, acetone, isopropyl alcohol. Isopropanol is a product of the organism formerly known as Clostridium butylicum, which is now included in the species Clostridium beijerinckii.