The correct option is C 2
LCM of 6 and 4:
Multples of 6: 6, 12, 18, 24, 30, ...
Multiples of 4: 4, 8, 12, 16, 20, 24, 28, ...
LCM of 6 and 4: 12
LCM of 5 and 10:
Multples of 5: 5, 10, 15, 20, 25, 30, ...
Multiples of 10: 10, 20, 30, 40, 50 ...
LCM of 5 and 10: 10
Difference between LCM(6 & 4) and LCM(5 & 10) = 12 - 10 = 2