Each vowel in the word 'KINDLE' 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?

Given: KINDLE

Logic: Change each vowel of the given word to the letter following it and change each consonant to the letter preceding it in the English alphabetical order.

K $$\rightarrow$$​ J; I $$\rightarrow$$​ J; N $$\rightarrow$$​ M; D $$\rightarrow$$​ C; L $$\rightarrow$$​ J; E $$\rightarrow$$​ F

So, the letter 'J' appears twice in the group of letters thus formed.

Thus, the correct answer is (b).