The correct option is B Lactobacillus
The bacteria mentioned in the question is Lactobacillus. They are anaerobic as they produce energy in the absence of oxygen. They are involved in the production of various dairy products like curd, milk, cheese. Rhizobium is a bacteria found in root nodules of leguminous crops and helps in nitrogen fixation. Whereas Penicillium and Saccharomyces are fungi.