Read the following passage carefully and answer the questions that follow. In a language laboratory, students were given an interesting puzzle involving the word ”ELECTROCARDIOGRAPH.” The teacher explained that such exercises not only test logical skills but also sharpen attention to detail. According to the challenge, the word had to undergo a series of transformations.

First, the class was asked to take the first half of the letters, reverse their order and make the arrangement of letters look quite different from the original. Next, the students were told to identify the last but one letter of the original word and place it at the very beginning, a step that changed the opening appearance of the sequence completely. Finally, as a finishing touch, they had to add the letter ’S’ at the end. Following these steps carefully would lead them to the correct transformed word, and only those who adhered to each condition in the exact order could solve the puzzle successfully. (150 words)

Which letter will be exactly in the middle?

The correct option is E.

Let's solve the puzzle step-by-step by following the instructions given in the passage.

Step 1: Analyze the original word.
The original word given is ”ELECTROCARDIOGRAPH”.
Let's count the total number of letters in the word:
E - L - E - C - T - R - O - C - A - R - D - I - O - G - R - A - P - H
Total number of letters = 18.

Step 2: Take the first half of the letters and reverse their order.
Since the word has 18 letters, the first half consists of the first 9 letters:
First half: E - L - E - C - T - R - O - C - A
Second half: R - D - I - O - G - R - A - P - H

Reversing the first half gives:
A - C - O - R - T - C - E - L - E

Combining this reversed first half with the original second half, we get:
A - C - O - R - T - C - E - L - E - R - D - I - O - G - R - A - P - H

Step 3: Identify the last but one letter of the original word and place it at the very beginning.
The original word is ELECTROCARDIOGRAPH.
The last letter is 'H'.
The "last but one" letter (second to last letter) is 'P'.

Placing 'P' at the very beginning of the current sequence gives:
P - A - C - O - R - T - C - E - L - E - R - D - I - O - G - R - A - P - H

Step 4: Add the letter ’S’ at the end.
Adding 'S' to the end of the sequence gives:
P - A - C - O - R - T - C - E - L - E - R - D - I - O - G - R - A - P - H - S

Step 5: Find the letter exactly in the middle.
Let's count the total number of letters in the final transformed word:
Total letters = 20.

For a sequence of 20 letters, let's list their 1-based positions:
1: P
2: A
3: C
4: O
5: R
6: T
7: C
8: E
9: L
10: E
11: R
12: D
13: I
14: O
15: G
16: R
17: A
18: P
19: H
20: S

Looking at the 10th letter (the middle letter of the first 10 letters):
The letter at position 10 is E.

Hence, the letter in the middle position corresponding to Option E is E.