Please choose the correct answer to the question: Which is the best explanation for how air masses move across the United States?

Answer1: The prevailing westerlies move air masses from west to east across the United States but may be deflected by the jet stream. Answer2: The trade winds move air masses from west to east across the United States. Answer3: The jet stream moves air masses from the Pacific Ocean across the United States. Answer4: The warm air of the Gulf Stream causes air masses to move from the Atlantic Ocean to the Pacific Ocean.

Answer format: answer1/answer2/answer3/answer4