Explanation:

- Let's examine the series: 4, 11, 30, 67, 128, 221, 346.

- Notice the pattern of differences between consecutive numbers:

- 11 - 4 = 7

- 30 - 11 = 19

- 67 - 30 = 37

- 128 - 67 = 61

- 221 - 128 = 93

- 346 - 221 = 125

- The differences are: 7, 19, 37, 61, 93, 125.

- These differences grow according to the pattern: +12, +18, +24, +32, +32.

- The key is the expected difference pattern, which should have been: +12, +18, +24, +30 (not 32).

- This suggests an error when transitioning from 93 to 125.

- Re-calculating gives: 93 + 30 = 123, pointing out 221 is wrong.

- Option 3, 221, is incorrect in the sequence.