[Lizard Ban] the Federal Aviation Administration Has Banned the Presence

[Lizard Ban] The Federal Aviation Administration has banned the presence of giant lizards on airplanes. Corina has a business training lizards for use in television and movies. Her star lizard, a massive iguana named Izzy, likes to have her own seat on the airplane. In order to promote her business, Corina has asked her home state of Montana to pass a law permitting giant lizards on airplanes.
-Under what circumstances may Montana regulate the same subject matter as the federal government?

A) Only when federal law expressly provides Montana with permission.
B) Only if there is no federal law regarding the subject matter in the Montana state law.
C) Only if the Montana law serves a compelling government interest.
D) Never. A state cannot regulate the same subject matter as the federal government.
E) When a person's compliance with Montana state regulation would not cause him or her to be in violation of a federal regulation.