Answer:
B. Pollution
Step-by-step explanation:
The passage describes the effect of pollution caused by the Industrial Revolution. During this time, the establishment and widespread use of steam-powered factories and mills led to the emission of hazardous chemical compounds into the environment. This pollution is reflected in the passage through the presence of fog everywhere, including the river, yards, ships, and even in the eyes and throats of people. The pollution from the factories and mills created a polluted and dirty city, causing the fog to defile the river and hover around the waterside. The passage illustrates the negative impact of industrial pollution on the environment and the health of the people living in the city.