Final answer:
Increased urbanization leads to job opportunities.
Step-by-step explanation:
The statement that best fills in the flow chart to explain the effects of migration into and out of urban areas is Option A: Increased urbanization leads to job opportunities.
Migration from rural areas to cities can lead to increased urbanization, which in turn creates more job opportunities. As more people move to urban areas, there is a greater demand for goods and services, which stimulates economic growth and creates employment opportunities.
For example, when people migrate to a city, they may start businesses, work in factories, or provide services such as healthcare or education. These activities contribute to the overall growth of the urban economy and provide job opportunities for both migrants and existing residents.