The position of how many letters will remain unchanged if each of the letters in the word ‘NIGHTMARES’ is re-arranged in the English alphabetical order from left to right?

The correct option is Four.

To determine how many letters remain in their original positions after re-arranging the letters of the word NIGHTMARES in alphabetical order, we can follow these steps:

Step 1: Write down the original word and identify the position of each letter.
The original word is NIGHTMARES. Let us list the letters and their corresponding positions from left to right:
1. N
2. I
3. G
4. H
5. T
6. M
7. A
8. R
9. E
10. S

Step 2: Arrange the letters of the word in alphabetical order.
Sorting the letters of the word NIGHTMARES in English alphabetical order gives:
A, E, G, H, I, M, N, R, S, T

Step 3: Compare the original positions with the new alphabetical positions.
Let us place the original sequence and the alphabetically sorted sequence side-by-side to compare:
Original Word:    N  I  G  H  T  M  A  R  E  S
Rearranged:        A  E  G  H  I  M  N  R  S  T

Comparing each column:
- Position 1: N changed to A
- Position 2: I changed to E
- Position 3: G remains G (Unchanged)
- Position 4: H remains H (Unchanged)
- Position 5: T changed to I
- Position 6: M remains M (Unchanged)
- Position 7: A changed to N
- Position 8: R remains R (Unchanged)
- Position 9: E changed to S
- Position 10: S changed to T

Therefore, the position of exactly 4 letters (G, H, M, and R) remains unchanged.