To answer this question, you need to understand the mythology of Roman gods.
Option A) Eros - This option is incorrect. Eros is the Greek god of love and desire, not a Roman god.
Option B) Neptune - This option is correct. In Roman mythology, Neptune is the god of the sea, and he is often depicted holding a trident, which is a three-pronged spear-like weapon.
Option C) Janus - This option is incorrect. Janus is the Roman god of beginnings, transitions, and endings, but he does not have a trident as his weapon.
Option D) Uranus - This option is incorrect. Uranus is not a Roman god. In Greek mythology, Uranus is the primordial god of the sky.
The correct answer is B) Neptune. Neptune is the Roman god associated with the trident, which is his weapon.