The correct option is C Vibrio cholerae
According to shape, bacteria are grouped into four types – Coccus or spherical shaped; bacillus or rod-shaped bacteria; spirillum or spiral/curved shaped bacteria; and vibrio or comma-shaped bacteria.
Vibrio cholerae is a comma shaped bacteria.
Bacillus clausii is a rod shaped bacteria.
Streptococcus pneumoniae is a coccus or spherical shaped bacteria.
Spirillum minus is a spiral shaped bacteria.