What impact would stricter car emission standards in the united states most likely have on other countries?

Foreign manufacturers will refuse to sell their cars in the U.S. D. Foreign car manufacturers will have to meet those emission standards on cars they export to the U.S.

The median is 4 because 2 x’s out 9, 3 x’s out 7, 3 x’s out 5, and 4 is the only remaining number.

Icould be wrong but i would say b.