Correct Option (B)
The given word is "INCOMPREHENSIBILITIES".
When the letters of this word are arranged in reverse order (i.e., the word is spelled backwards), the resulting arrangement is "SEITILIBISNEHERPMOCNI".
Comparing the original word with the reversed word, position by position:
- Original Word: I N C O M P R E H E N S I B I L I T I E S
- Reversed Word: S E I T I L I B I S N E H E R P M O C N I
Upon comparison, only the letter 'N' at the 11th position from the left retains its original place. All other letters have shifted from their initial positions.
Therefore, only one position of a letter remains unchanged.
Incorrect Options:
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Option (A) None: This is incorrect because, as demonstrated, one letter ('N') does remain in its original position after the word is spelled backwards.
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Option (C) Two: This is incorrect as the detailed comparison reveals that only one letter's position remains unchanged.
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Option (D) Three: This is incorrect as the analysis confirms that only a single letter retains its original position.