Spore forming bacteria

Answer: Option C

Spore-forming bacteria Bacillus and Clostridium.
Spore-forming bacteria include Bacillus (aerobic) and Clostridium (anaerobic) species. The spores of these species are dormant bodies that carry all the genetic material as is found in the vegetative form but do not have an active metabolism.
These bacilli are ubiquitous, and because they form spores, they can survive in the environment for many years.