Why is it acceptable for a fecal sample to be collected in a nonsterile container?

A) Fecal samples can be runny and if the specimen leaks, this can present a biohazard.
B) Many types of bacteria call the intestinal tract home; the specimen cannot become contaminated.
C) Leakproof containers are always sterile, so the container will be leakproof, as well as sterile.
D) Because DNA probes can determine resident flora from pathogenic bacteria.