If the courts rule a law unconstitutional, what is the effect?

When the proper court determines that a legislative act (a law) conflicts with the constitution, it finds that law unconstitutional and declares it void in whole or in part. This is called judicial review.

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."

i believe the answer to your question is b. pay your bills early