Explanation:

- In the code language, each letter is converted to its position in the alphabet (A=1, B=2, ..., Z=26).

- 'TRAIN':

- T = 20, R = 18, A = 1, I = 9, N = 14

- Combined, this becomes '14911820'.

- 'POLIT':

- P = 16, O = 15, L = 12, I = 9, T = 20

- Combined, this becomes '209121516'.

- For 'SHNKE':

- S = 19, H = 8, N = 14, K = 11, E = 5

- The coded form is '51114819':

- Combined, this becomes '51114819'.

- Option 1: 51114919

- Incorrect because it doesn't match the code for 'SHNKE'.

- Option 2: 5114819

- Incorrect because it doesn’t match all letters' positions.

- Option 3: 51114819

- This correctly represents the positions of 'S', 'H', 'N', 'K', 'E'.

- Option 4: 51411819

- Incorrect due to misplaced numbers.