Final answer:
Mars has the most extreme seasons among the options provided, with a similar axial tilt to Earth's that causes seasonal changes and more elliptical orbit that increases these variations.
Step-by-step explanation:
The planet with the most extreme seasons among the options provided (Venus, Mars, Jupiter, Saturn) is Mars. Mars has an axial tilt of 25.2°, which is similar to Earth's tilt of 23.4°, leading to the presence of season cycles. However, because Mars has a more elliptical orbit than Earth, it experiences more extreme temperature variations between seasons. In comparison, Venus has a very slight axial tilt near 3°, providing almost no seasonal variation. Jupiter's tilt of just 3° results in minimal seasons, and Saturn, with a tilt of 27°, does have seasons but they are not as extreme as Mars'.