Explanation:

Let’s break down the code:

- MACHINE ? CAMHENI

By comparing the letters:

- M ? C (First letter shifts to third position)

- A ? A (Second letter stays at the second place)

- C ? M (Third letter moves to the first position)

- H ? H (Fourth letter stays in place)

- I ? E (Sixth to fifth position)

- N ? N (Seventh letter remains at seventh)

- E ? I (Fifth to sixth position)

- Now, let's apply the same pattern for MONSTER:

- M (1st) will go to third position

- O (2nd) stays second

- N (3rd) goes to first

- S (4th) stays in fourth

- T (5th) goes to sixth

- E (6th) goes to fifth

- R (7th) remains seventh

- Arrange as per pattern: 3rd,2nd,1st,4th,6th,5th,7th ? N O M S E T R

- Now let's check options:

1. OMNSETROption: Rearranged as 2nd,1st,3rd,...

2. NOMSRET: This matches our mapping.

3. SNOMRET: The 4th at first, not matching.

4. NOMETSR: Last letters swapped.

- Final check: NOMSRET exactly fits the pattern.

So, the correct answer is:

Option:2, NOMSRET