You know these facts about a region: Ninety percent of the region’s population lives in cities full of coal-burning factories; a wide, deep river connects those cities; the population is highly educated and includes a low percentage of foreign-born residents. Which of the following would be a reasonable inference about this region?(1 point)

The population is probably aging.
The population is probably aging.

Air and water pollution are probably major environmental problems in the region.
Air and water pollution are probably major environmental problems in the region.

Poverty is probably widespread.
Poverty is probably widespread.

Agriculture is a major economic activity.

Air and water pollution are probably major environmental problems in the region.

The reasonable inference about this region based on the given facts is:

Air and water pollution are probably major environmental problems in the region.

Based on the given facts about the region, a reasonable inference would be:

Air and water pollution are probably major environmental problems in the region.

To arrive at this conclusion, we can analyze the given facts:

1. Ninety percent of the population lives in cities full of coal-burning factories: This indicates that the region heavily relies on coal-burning factories for industrial production and energy generation. Such factories are known to be significant contributors to air and water pollution due to the emissions they release.

2. A wide, deep river connects those cities: This implies that the pollution generated by the coal-burning factories could potentially affect the river, leading to the contamination of water resources. The river's width and depth suggest that it plays a crucial role in transportation and is likely a major source of water for the cities.

Considering these facts, it is reasonable to infer that air and water pollution are major environmental problems in the region. The heavy reliance on coal-burning factories in cities, coupled with the presence of a significant waterway connecting them, creates a higher likelihood of pollution impacting the air and water quality.

Therefore, the correct answer is:
Air and water pollution are probably major environmental problems in the region.