The correct answer is C. Thin, greenish, foamy discharge.
Explanation
A vaginal yeast infection is a concept used to refer to a vaginal infection that occurs when healthy yeasts that normally live in the vagina reproduce uncontrollably. The most common symptoms are itching, thick vaginal discharge, white or yellow gummy. In this infection, a greenish foamy discharge is not common because this type of discharge indicates sexual transmitted diseases or infections such astrichomoniasis and chlamydia rather than a yeast infection. So, the correct answer is C. Thin, greenish, foamy discharge.