It forms a boundary between a cold air mass and a warm air mass. It creates the high winds around the eye of a hurricane. It forces the hot air along the equator to rise to areas in North America. It causes high pressure air masses to rotate clockwise.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which best describes a characteristic of the jet stream?
Possibilities:
- It forms a boundary between a cold air mass and a warm air mass.
- It creates the high winds around the eye of a hurricane.
- It forces the hot air along the equator to rise to areas in North America.
- It causes high pressure air masses to rotate clockwise.

It forms a boundary between a cold air mass and a warm air mass.