Answer the following questions by selecting the correct/most appropriate options.

The atmosphere is a thin layer of air surrounding the Earth. What keeps the air to remain around the earth?

Correct option is D

The gravitational force of the Earth is the fundamental reason why the atmosphere remains bound to our planet. This force pulls everything towards the center of the Earth, including the gases that make up the atmosphere. Without the Earth's gravity, these gases would drift off into space, leaving the planet without air to breathe and without the protection against the sun's radiation provided by the atmospheric layer. The atmosphere plays a crucial role in sustaining life by maintaining the balance of necessary gases such as oxygen and carbon dioxide and by regulating the Earth's temperature through the greenhouse effect. Thus, Earth's gravity not only keeps the atmosphere in place but also ensures the conditions necessary for life to thrive.
 The Earth's gravitational force plays a crucial role in maintaining the atmosphere close to the planet's surface.
 Gravitational force, by definition, is the attraction between any two objects that possess mass.
 Remarkably, the mass of the Earth's atmosphere constitutes merely about 1/1,200,000 of the Earth's total mass, illustrating how the atmosphere acts like a delicate layer enveloping the Earth.
 It is this gravitational pull that securely holds this fragile layer in place, ensuring that it doesn't drift away into space.