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BRAINLIEST!! HELP PLEASE!!

9. Which of the following is a true statement about lake-effect snow?

a) Lake-effect snow is caused when a tropical air mass from the United States moves over the warmer Great Lakes.

b) Lake-effect snow is caused when a continental polar air mass from Canada moves over the warmer Great Lakes.

c) Lake-effect snow is caused when an arctic air mass from Canada moves over the warmer Great Lakes.

d) Lake-effect snow is caused when a continental polar air mass from the United States moves over the warmer Great Lakes.