Weather is associated with the layer of the atmosphere.

The question is asking us to fill in: Weather is associated with the(...) layer of the atmosphere. Weather is something that we experience, so we would be expecting the lowest layer of the atmosphere - the one we live in. And this is correct! this level is called Tropophere - and this is the correct answer. Troposphere is the layer that ends around 6-10 km away from the Earth's surface.