Answer:
Step-by-step explanation:
If you limit competition, you make it impossible for a trade bloc to be anything but lazy. Competition is the very heart of keeping companies thriving.You never want to limit competition.
Increasing barriers to trade only looks like an answer. After all,If you bloc goods on one side, you make them suffer, but you also hurt yourself. THey have nothing to give you for your goods.
You could do C. That helps you. It might might make you more competative, but it won't help your neighbors. It is the second best answer.
What is really does is allow countries to pool their resources