The correct answer is option 1: Earth`s most internal layer. The layer called the "Barysphere" refers to the innermost layer of the Earth, also known as the inner core. It is located at the center of the Earth and consists mainly of solid iron and nickel. This layer is approximately 1,220 kilometers in radius and has extremely high temperatures and pressure. It is responsible for generating Earth`s magnetic field. Option 2, Earth`s intermediate layer, is incorrect as this layer is called the "Mesosphere". Option 3, Earth`s topmost layer, is incorrect as this layer is called the "Atmosphere". Option 4, lowest part of the atmosphere where climate changes occur, is incorrect as this layer is called the "Troposphere".