Question

what was the underlying problem leading to the case of brown v. board of education?
a man was forced to sit in a dilapidated, segregated train car.
a man was forced back into slavery after moving to a free state.
a girl was forced to walk a long distance to a segregated school

Explanation:

The case of Brown v. Board of Education was centered around school segregation. The key point is that it involved a girl (Linda Brown) who had to walk a long distance to a segregated school. The other options refer to different historical cases (e.g., the train car - Plessy v. Ferguson, forced into slavery - Dred Scott case).

Answer:

A girl was forced to walk a long distance to a segregated school.