Final answer:
Tethys was the Titan goddess of fresh water and mother of rivers, oceanids, and clouds in Greek mythology.
Step-by-step explanation:
The subject of the question is Greek mythology. Tethys is the correct answer. In Greek mythology, Tethys was the Titan goddess of fresh water and the wife of Oceanus, the earth-encircling, fresh-water stream. She was the mother of the Potamoi (Rivers), the Okeanides (Oceanids), and the Nephelai (Clouds).