Explanation:

- In the original set (16, 12, 32):

- 16 multiplied by 2 equals 32.

- Subtracting 12 from 32 gives 20.

- Option 1: (20, 15, 42)

- 20 multiplied by 2 equals 40, not 42.

- Subtracting 15 from 42 gives 27, not matching the required pattern.

- Option 2: (76, 57, 176)

- 76 multiplied by 2 equals 152, not 176.

- Subtracting 57 from 176 gives 119, not matching the required pattern.

- Option 3: (36, 27, 77)

- 36 multiplied by 2 equals 72, not 77.

- Addressing the subtraction pattern, subtracting 27 from 77 gives 50, which should ideally match a consistent pattern across valid options.

- Option 4: (56, 24, 68)

- 56 multiplied by 2 equals 112.

- Subtracting 24 from 68 gives 44, not matching the required pattern.