The correct answer is option 1: Helium and Hydrogen.

The exosphere is the outermost layer of the Earth`s atmosphere, extending from about 500 kilometers above the Earth`s surface. In this layer, the density of gases is extremely low, and molecules are often found in a semi-energetic state where they can escape the Earth`s gravitational pull.

Helium and Hydrogen are the two main gases found in the exosphere. Helium is the second lightest element in the periodic table and is commonly found in small amounts in the Earth`s atmosphere. It is often released from deep within the Earth`s crust during volcanic activity. Hydrogen, on the other hand, is the lightest element and is also found in small amounts in the exosphere.

Neon and Oxygen, which are mentioned in options 2 and 3, are not typically found in significant quantities in the exosphere. Neon is a noble gas and is more commonly found in the Earth`s atmosphere. Oxygen, on the other hand, is a component of the lower layers of the atmosphere but becomes less abundant as we move higher up.

Option 4, which mentions Helium and Neon, is partially correct as helium is indeed present in the exosphere, but neon is not a significant