To answer this question, we need to have knowledge about the Hindu epic, Mahabharata, in which Satyavati is a prominent character.
Option A) King Shatanu - This option is incorrect. King Shatanu was not the first husband of Satyavati. He was the second husband of Satyavati and the father of Bhishma.
Option B) Parashar Muni - This option is correct. Parashar Muni was the first husband of Satyavati. They had a son together named Vyasa, who later became an important character in the Mahabharata.
Option C) Prabhasa - This option is incorrect. Prabhasa was not the first husband of Satyavati.
Option D) Dasaraja - This option is incorrect. Dasaraja was not the first husband of Satyavati.
The correct answer is B) Parashar Muni. Parashar Muni was the first husband of Satyavati.