Which of the Following Best Illustrates the Dormant Commerce Clause

Which of the following best illustrates the dormant commerce clause?

A) When Congress "falls asleep" and does not exercise its powers.
B) Anything that moves in channels of interstate commerce is "commerce."
C) A federal law that discriminates against certain commerce depending on which state is trying to export the good or service.
D) If a state law is an "undue burden" on interstate commerce, it will be struck down.
E) If one state discriminates in its treatment of any article of commerce based on its state of destination, the court will strike down the law.