Correct Answer: B
Explanation:
Putrefaction is the decomposition of animal proteins, especially by anaerobic microorganisms, described as putrefying bacteria.
Putrefying organisms are those, which decompose dead organism.
Putrefying bacteria are bacteria involved in putrefaction of living matter. Putrefying bacteria is one of the main processes in the nitrogen cycle; other than putrefying bacteria there are denitrifying bacteria, nitrifying bacteria and nitrogen-fixing bacteria.