D.) Greater than it is in the United States.
Belgium, Norway, and Sweden have some of (if not the strongest) worker reforms and workers unions in the world. They have some of the highest paying wages along with the highest employment rates as well.
Compared to the United States, there are very few organized unions. Those that do exist have very few protections by law. This means the U.S. has some of the weakest worker reforms in the world, along with some of the fewest number of unions.