Let's go through the options:
A. Venus: Venus is the second planet from the Sun, with a dense atmosphere composed primarily of carbon dioxide. So Venus matches with a dense atmosphere.
B. Saturn: Saturn is a gas giant, best known for its prominent ring system made of ice particles and rock debris. So Saturn matches with having a prominent ring system.
C. Mercury: Mercury is the smallest and innermost planet in the Solar System. Its orbital period around the Sun of 88 Earth days is the shortest of all the planets in the Solar System. So Mercury matches with being the innermost and smallest planet.
D. Jupiter: Jupiter is the largest planet in the Solar System, a gas giant with a mass one-thousandth that of the Sun but two and a half times that of all the other planets in the Solar System combined. So Jupiter matches with being the largest planet.
Based on the above, all the options correctly match the planet with its characteristics. So the answer is that there is no incorrect match.
The option that is NOT correctly matched would be if, for example, option C said "Mercury: Mercury is the largest planet in the solar system". This would be an incorrect match. But since all the given options correctly match the planet and its characteristics, the answer is that there is no incorrect match.