The United States has placed a limit on the amount of tuna in airtight containers that can be imported into this country. This is an example of a(n) .

answer; validity;

answer; transportation, store's,a whole lot more of ugly people,ect

answer; (d) they are in charge of the ushers and making sure the audience gets to their seats on time; they also control the box office; i know (c) is wrong and (b) don't make sense;