What is preemption and why is it often unpopular with advocates of the state's rights?

Conflict preemption compliance with both federal and state regulations is a physical impossibility, or, where state law stands as an obstacle to the accomplishment and execution of the full purposes and objectives of congress.

the navigation act prevented the colonies from exporting to countries other than britain and it prevented the importation of goods by other countries as well. so i believe the correct answer is d. other nations could not deliver goods to the colonies.

hope this .

there is no image for me to refer