Explanation:


A natural satellite is a celestial body that orbits around a planet or any other body in space. Some planets have multiple satellites, while others have none. The question asks which of these planets have no natural satellites, and the correct answer is option B, which includes Mercury and Venus.

Mercury:


Mercury is the smallest planet in the solar system, and it is the closest planet to the sun. It has no natural satellites orbiting around it. Scientists believe that the gravitational pull of the sun is so strong that it prevents any moon from forming around Mercury.

Venus:


Venus is the second planet from the sun, and it is also known as the Earth's twin because of its size, mass, and proximity to the sun. Venus has no moons orbiting around it, and scientists believe that it is because of its slow rotation. Venus rotates very slowly, taking 243 Earth days to complete one rotation, and this slow rotation may prevent the formation of any natural satellites.

Mars, Uranus, and Jupiter:


Mars is the fourth planet from the sun, and it has two natural satellites, Phobos, and Deimos. Uranus is the seventh planet from the sun, and it has 27 natural satellites, including Miranda, Ariel, Umbriel, Titania, and Oberon. Jupiter is the fifth planet from the sun, and it has the most natural satellites in the solar system, with 79 moons, including Io, Europa, Ganymede, and Callisto.

Conclusion:


To sum up, the correct answer to the question is option B, which includes Mercury and Venus. These two planets have no natural satellites orbiting around them, and the reason for this may be because of the strong gravitational pull of the sun and the slow rotation of Venus.