Option 1: This option is incorrect. While Jupiter is indeed the largest planet in the Solar System, Mercury is actually the smallest planet.

Option 2: This option is also incorrect. While Jupiter is the largest planet, Saturn is the second largest, not Neptune.

Option 3: This is the correct answer. Jupiter is the largest planet, followed by Saturn, Uranus, and Neptune. These four planets are the largest in the Solar System in descending order.

Option 4: This option is incorrect. Similar to option 1, Mercury is the smallest planet and should not be included in the list of the four largest planets.

Therefore, the correct answer is option 3.