What is happen if chain became superpower ?​

There is no doubt that China has already become the global powerhouse economically, and is expected to surpass the US as the world's biggest economy by 2028. ... Like the Soviet Union in the past, China now faces several geopolitical and cultural challenges before it can reach global superpower status similar to the US.

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer