Each vowel in the word PACKED is changed to the letter following it in the English alphabetical order and each consonant is changed to the letter preceding it in the English alphabetical order. Which of the following letters will appear twice in the group of letters thus formed?

Word - PACKED

Let's break down the transformation of each letter in the word PACKED

P (consonant) changes to the letter preceding it: O

A (vowel) changes to the letter following it: B

C (consonant) changes to the letter preceding it: B

K (consonant) changes to the letter preceding it: J

E (vowel) changes to the letter following it: F

D (consonant) changes to the letter preceding it: C

So, the transformed letters are: O, B, B, J, F, C

We can see that the letter B appears twice in the group of letters.

Thus, correct answer is option (b).