500
Rosario sues Demerest in state court, claiming that Demerest fired him based on his age, a violation of the federal Age Discrimination act. The state court should
a. Hear the suit. Unless Df removes.
b. Hear the case only if the parties are not diverse.
c. Dismiss the case, because it arises under federal law and must be filed in federal court
d. Dismiss the case, unless Congress has expressly authorized bringing such federal claims in state court.
What is a. Hear the suit, unless Df removes.