The correct answer is - B. jobs and other opportunities.
People have been moving intensely from the rural areas to the urban areas in the past few decades, and this is because the main focus of the economic development was and is concentrated in and around the big urban areas. Because of this, the biggest amount of money, job opportunities, and progress on a career level, are mostly available at the big urban areas, so people have been moving towards them in order to have a better life and better job.
