If two states, such as Colorado and Nebraska, have a dispute over a law, the issue will be resolved in-

front of the Supreme Court.

Explanation:

When two or more states, such as in this case are having certain dispute then the Supreme Court is  having the jurisdiction.

For example this was especially often during the period when the country was created, as the states had border disputes. In those cases Supreme Court brought main decisions.

i believe we're not a republic so that is a hard question

the answer is prolly b