Which of these planets in our solar system is closest to the sun?

Venus is the planet closest to the sun among the options given. This is due to the positioning of the planets in our solar system, which are arranged in order of their distance from the sun. The closest planets to the sun are Mercury and Venus, with Mercury being the closest overall. Venus follows Mercury as the second closest, while Earth comes next in order, followed by Mars and then Saturn. Understanding this order helps clarify the relative distances of the planets from the sun.