In large intestine, vitamin K is formed by the activity of:

Explanation

[A] Symbiotic bacteria are bacteria that live in a symbiotic relationship with other organisms. It benefits both the organisms like Escherichia coli live in symbiotic association in human intestine and produce large quantities of vitamin K and in human intestine. [B] An obligate aerobe is an organism that requires oxygen to grow. Through cellular respiration, these organisms use oxygen to metabolise substances, like sugars or fats, to obtain energy. [C] parasite bacteria live on or in a host organism and get their food from or at the expense of its host. [D] Bacteria that can use dissolved oxygen (DO) or oxygen obtained from food materials such as sulphate or nitrate ions, or some can respire through glycolysis