Which of the following are the terrestrial planets in our solar system?

The terrestrial planets in our solar system are defined by their solid, rocky surfaces and are located closer to the Sun compared to the gas giants. The planets that fit this definition are Mercury, Venus, Earth, and Mars.

Mercury is the closest planet to the Sun and is characterized by its small size and lack of a significant atmosphere. Venus is similar in size and composition to Earth but has a thick, toxic atmosphere with extreme temperatures. Earth is the only known planet to support life, with a diverse environment and liquid water. Mars, often referred to as the "Red Planet," has surface features both similar to both the Moon and Earth, including the largest volcano and canyon in the solar system.

The other choices include gas giants, dwarf planets, and combinations that do not reflect the characteristics of terrestrial planets. For example, Jupiter, Saturn, Uranus, and Neptune are gas giants with thick atmospheres composed mainly of hydrogen and helium, lacking solid surfaces. Pluto, while once classified as the ninth planet, is now considered a dwarf planet, and does not meet the criteria for being a terrestrial planet. Thus, only the combination of Mercury, Venus, Earth, and Mars qualifies as the terrestrial planets.