Response bias goes toward the 3rd one and question wording goes to the 2nd
The correct answer is isolationism: the policy of keeping other countries at a distance and separate from the own country and not allowing other countries to intervene in one's own politics. Specifically, China banned international trade with only very few exceptions.
Answer: B. Trees
Explanation: If trees can grow on Antarctica with carbon dioxide levels not much higher than today’s, it suggests that small changes in carbon dioxide can lead to big changes in climate. Hope this helped! :)