Explanation:

- In the original sets, observe the relationships:

- (30, 14, 8): 30 - 14 = 16 and 14 - 8 = 6.

- (84, 12, 36): 84 - 12 = 72 and 12 - 36 = -24.

- We need a similar relationship in one of the options.

- Option 1: (108, 18, 45)

- 108 - 18 = 90 and 18 - 45 = -27.

- Option 2: (68, 14, 49)

- 68 - 14 = 54 and 14 - 49 = -35.

- Option 3: (21, 28, 11)

- 21 - 28 = -7 and 28 - 11 = 17.

- Option 4: (24, 8, 10)

- 24 - 8 = 16 and 8 - 10 = -2.

- Option 1 does not match the structure of the original sets.

- Option 4 follows the pattern where the first number minus the second is positive, and the second minus the third is negative.

- Correct answer: Option 4 (24, 8, 10)