The correct answer is option 4, Willy-Willy.

Option 1, a typhoon, is a term used to describe a fierce tropical revolving storm that occurs in the Northwest Pacific Ocean. It is not specific to North-West Australia, so it is not the correct answer.

Option 2, a tornado, is a violent and destructive rotating column of air that is typically associated with severe thunderstorms. Tornadoes occur in many parts of the world, including North America, but they are not specific to North-West Australia. Therefore, option 2 is incorrect.

Option 3, a hurricane, is a powerful tropical revolving storm that typically forms over warm ocean waters. While hurricanes do occur in various parts of the world, they are most commonly associated with the Atlantic Ocean and the Eastern Pacific Ocean. They are not specific to North-West Australia, so option 3 is not the correct answer.

Option 4, Willy-Willy, is the correct answer. A Willy-Willy is a term used in Australia to describe a fierce tropical revolving storm that occurs in North-West Australia. They are characterized by strong winds and can be quite destructive. Therefore, option 4 is the correct answer for this question.