C) the poor living conditions for those living in poverty.
Explanation:
The effect of urbanization in the 1800s that can be supported by evidence in this photo is "the poor living conditions for those living in poverty".
The photo depicts how the people lived during the period of urbanization in the 1800s. There was congestion in residential areas. Also, accommodation was found in narrow tenement buildings. The picture also depicts that the poor people lived in dark, unpleasant and unhealthy environments.
