Which statement accurately describes a supreme court power that played a role in ending segregation in public schools?

a.
the court chooses which laws passed by congress are sent to the president for signature.

b.
the court can repeal a law if it is found to be unpopular with the majority of the people.

c.
the court's main job is to decide issues of guilt or innocence in criminal trials.

d.
the court determines the constitutionality of laws and previous legal rulings.