Explanation:

- Option 1: Mesosphere

- The mesosphere is part of the Earth's atmosphere, located above the stratosphere.

- It is not related to Earth's tectonic plates.

- Option 2: Asthenosphere

- The asthenosphere is a semi-fluid layer beneath the lithosphere.

- It allows tectonic plates to move, but it isn't made of plates itself.

- Option 3: Biosphere

- The biosphere encompasses all living organisms on Earth.

- It does not relate to Earth's structural layers.

- Option 4: Lithosphere

- The lithosphere is the Earth's outer layer, comprising crust and upper mantle.

- It is divided into tectonic plates that fit like a jigsaw puzzle.

Therefore, your choice, Option 4: Lithosphere, is correct.