The correct answer is (a). The Earth is located between Venus and Mars in the Solar System. It is the third planet from the Sun and the only astronomical object known to harbor life. The Earth is the fifth largest planet in the Solar System and the largest of the four terrestrial planets. It is a terrestrial planet with a solid surface, and is the only planet in the Solar System known to have active plate tectonics. The Earth’s atmosphere is composed mostly of nitrogen and oxygen, and it has a surface temperature of about 15 degrees Celsius. The Earth is home to a wide variety of life, including plants, animals, and humans.
Option (b) is incorrect because Mars is located between the Earth and Jupiter. Option (c) is incorrect because Venus is located between the Earth and Mercury. Option (d) is incorrect because Mercury is the closest planet to the Sun.