Answer: C. improve the quality of products.
Step-by-step explanation:
From the list given, we are informed that a new international trade agreement is established which ultimately led to the plan by the foreign manufacturers to increase exports to the United States.
We should note that the above scenario will lead to the U.S manufacturers facing more competition in the domestic marketplace and for them to be able to compete with their foreign counterparts, they'll need to improve the quality of their products.