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None of them. The LCM of 3 and 12 is 12. The LCM of 2 and 18 is 18. The LCM of 4 and 6 is 12. The LCM of 6 and 8 is 24. The LCM of 4 and 6 and 8 is 24. If you meant 12 and 18, choose that one.
LCM of 8, 5 and 12 is 120...
LCM of 8 and 9 and 12 is 72.
The LCM of 6 & 10 is 30.
The LCM is 36.