A 16-year-old woman is visiting her gynecologist for her first checkup. On ultrasound examination it is noted that the woman has a double uterus. Failure of which of the following processes is responsible for the double uterus? A: Fusion of the inferior parts of the paramesonephric ducts B: Fusion of the superior parts of the mesonephric ducts C: Development of the hymen D: Development of the sinovaginal bulbs E: Fusion of the inferior parts of the mesonephric ducts