Why Are Fermented Soy Products,sea Algae,and Most Nutritional Yeast Products

Why are fermented soy products,sea algae,and most nutritional yeast products poor sources of vitamin B₁₂?

A) The vitamin is not in a bioavailable form
B) These foods contain high amounts of antiintrinsic factor
C) The vitamin is readily destroyed by the presence of microbes
D) These foods contain high levels of folate,which inhibits B₁₂ absorption