Final answer:
The wind currents pushing air across the USA from west to east are the Jet Stream and the Prevailing Westerlies, making option C the correct answer.
Step-by-step explanation:
The wind currents that push wind across the USA from the west coast to the east coast are the Jet Stream and the Prevailing Westerlies. The Jet Stream consists of fast-flowing, narrow air currents in the upper atmosphere that move from west to east and can significantly influence weather patterns. The Prevailing Westerlies are the winds found in the mid-latitudes between 30 and 60 degrees latitude, which also blow from the west to the east and are responsible for the movement of weather systems across the United States. Thus, the correct answer to the student's question is C) Jet Stream and Prevailing Westerlies.