Which one of the following represents the inner planets?

The solar system is divided into two primary groups: the inner planets and the outer planets. The inner planets, also known as terrestrial planets, include Mercury, Venus, Earth, and Mars [2]. These planets are characterized by their rocky composition, high density, and solid surfaces made of silicates and metals [3]. Geographically, they are defined as the planets of the 'inner circle' because they lie between the Sun and the belt of asteroids [3]. The asteroid belt, located between the orbits of Mars and Jupiter, serves as the boundary separating these small, rocky inner planets from the larger gas giants of the outer solar system [2]. While the term 'inferior planets' specifically refers to those between the Sun and Earth (Mercury and Venus), the 'inner planets' encompass all four terrestrial bodies located within the asteroid belt's perimeter [2].

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > Inner Planets > p. 27
2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > 2.4. Planets > p. 25
3. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > The Formation of the Planets > p. 18