The answer to this is D. When this happens, the nurse should know that the patient is going to give birth soon. Expelling of clear vaginal fluid may occur during the first stage of labor. It may even signify that labor is already starting. The contractions may start since then and a regular labor would become more frequent as the mother goes nearer into giving birth.
The rupture of the membranes also occurs during the first stage of labor which means that the only option is D. This usually ends when the mother finally gives birth to her child. A child who has been properly trained for this situation will be able to determine the proper signs.