The correct answer is B) job opportunities.
What BEST completes the chart is "Job Opportunities."
That is how space has been a divisive factor in the past and present. The other issue that completes the chart is job opportunities because this has represented a major problem in society. For different reasons, not all people can have the opportunity to get a job, or a decent job, or the kind of job that allows them to feel satisfaction for what they do and get the kind of income they want to cover their necessities.