Final answer:
All four Jovian planets—Jupiter, Saturn, Uranus, and Neptune—have ring systems, making the correct answer to the question 'E) 4'.
Step-by-step explanation:
The number of Jovian planets in our solar system with rings is four. These include Jupiter, Saturn, Uranus, and Neptune. Each of these gas giants is surrounded by a system of rings and moons.
Saturn is particularly famous for its bright, extensive ring system, which is easily visible through a small telescope. However, Jupiter has a tenuous ring system made primarily of dust, Uranus, and Neptune both have rings made of dark material that are less visible.