Concept:Layers of the Earth's Atmosphere.Explanation:The Earth's atmosphere is divided into several layers based on temperature changes with altitude. Starting from the surface and moving upwards, these layers are:1. Troposphere: This is the lowest layer, extending up to about 10 km. It's where we live, and all weather phenomena occur. Since it's the closest to the Earth's surface, it experiences the most direct influence of the ground.2. Stratosphere: Above the troposphere, this layer contains the ozone layer.3. Mesosphere: Above the stratosphere, where most meteors burn up.4. Thermosphere: Above the mesosphere, where satellites orbit.5. Exosphere: The outermost layer, gradually fading into space.Given that the troposphere is the lowest layer and where all human activities and weather take place, it is the layer nearest to the Earth's surface.Answer:B. Troposphere