Perhaps because of the pollution caused by the industrial revolution, british art in the late 18th - and early 19th -centuries seemed to focus on:

The correct answer is landscape.

They would either show beautiful sceneries found in nature where the pollution from industrialization had not yet reached, or they would show the factories and the smog and the fog of urban areas such as London as a way of criticizing the society and how it allowed the industry to pollute so much of the air and the land.