The correct answer is (b) Displaced workers came to cities to find work in new factories.
Industrialization brought about a shift from an agricultural-based economy to a manufacturing-based economy, which led to the creation of new factories and industries in urban areas. This resulted in an increase in job opportunities, and many people from rural areas migrated to the cities in search of work. This process is known as urbanization. Therefore, option (b) is the correct answer.