Concept:A natural satellite is an object that orbits a planet and is not man-made. Different planets have different numbers of natural satellites.Explanation:Most planets have at least one natural satellite. Earth has 1 moon and Mars has 2 moons. Jupiter and Saturn have many moons. Mercury and Venus are the only two planets in our solar system that have no natural satellites. Their gravitational conditions and closeness to the Sun make it difficult for them to capture or hold a moon. Hence, both Mercury and Venus have 0 natural satellites.Answer:Mercury and Venus.Correct option: A.