Final answer:
The ground is part of the lithosphere, comprising the solid rock and soil of the Earth's surface.
Step-by-step explanation:
The lithosphere is the outermost layer of the Earth's crust and is essentially made up of land. Therefore, the ground is part of the lithosphere, as it comprises the solid rock and soil that make up the Earth's surface. Birds belong to the biosphere and mostly interact with the atmosphere, rivers are part of the hydrosphere, and air is a component of the atmosphere. Thus, the correct answer to the question which of the following is part of the lithosphere is B. The ground.
The lithosphere is the outermost layer of the Earth's crust and is part of the biosphere. It includes the land, surface rocks, and the ground. Therefore, the ground is the correct answer option that is part of the lithosphere.