Concept:In this code, the first and last letters remain fixed. The middle letters are rearranged by swapping the two letters in each adjacent pair.
Explanation:Take CALANDER. The first letter is C and the last letter is R, so both stay fixed.
The middle letters are A, L, A, N, D, E.
Group them into pairs: AL, AN, DE.
Interchange the letters in every pair: AL becomes LA, AN becomes NA, DE becomes ED.
So the middle part becomes LANAED.
Now put C at the front and R at the back.
This gives CLANAEDR, which matches the given code.
Apply the same rule to CIRCULAR.
The first and last letters C and R remain fixed.
The middle letters are I, R, C, U, L, A.
Group them into pairs: IR, CU, LA.
Swap each pair: IR becomes RI, CU becomes UC, LA becomes AL.
The new middle part becomes RIUCAL.
Place C at the front and R at the back.
The final code is CRIUCALR.
Answer:Option B: CRIUCALR.
