The vaginal fluid is strogly acid with ph 4.5 this mainly related to.. The action of doderlein's bacili on glucogen found in the squamous epithelium of the vagina

The vaginal fluid is strogly acid with ph 4.5 this mainly related to:

A. The fact that there are no gland in the vagina.
B. The mucus from the cervix.
C. The action of doderlein's bacili on glucogen found in the squamous epithelium of the vagina***
D. none of the above.