The correct response would be all spheres.
The disappearance of the sun would have profound effects on the atmosphere (as it would lead to a dramatic drop in temperature and changes in atmospheric conditions), the biosphere (as all life on Earth relies on sunlight for energy), and other spheres such as the lithosphere and hydrosphere, which would also be affected by the absence of solar energy. Thus, the impact would be felt across all spheres of the Earth system.