The correct option is B Treponema pallidum
Syphilis is caused by a spirochete (a worm-like spiral-shaped bacteria) called Treponema pallidum. You can get the bacteria in the following ways: direct contact with a syphilis sore (usually found on the vagina, anus, rectum, in the mouth, or on the lips) during vaginal, anal, or oral sex with an infected person.
Neisseria gonorrheae causes gonorrhea disease, which is also an STD.
Pasteurella pestis also known as Yersinia pestis is a gramnegative, rod-shaped coccobacillus, a facultative anaerobic organism that can infect humans via the oriental rat flea. It causes the deadly disease called Bubonic plague.
Clostridium botulinum causes the botulism disease.