Step 1: Understanding the question.
The question involves decoding a pattern where each letter in "APPLE" shifts to form "BQQMF".
Step 2: Analyzing the options.
The pattern is each letter increased by 1: A→B, P→Q, P→Q, L→M, E→F. Applying to "BANANA": B→C, A→B, N→O, A→B, N→O, A→B.
(A) CBOBOB: Correct — Matches the shift.
(B) CBOCOB: Incorrect — Wrong positioning.
(C) CBBOCB: Incorrect — Mismatch in letters.
(D) CBOBOC: Incorrect — Ends wrongly.
Step 3: Conclusion.
The correct answer is (A) CBOBOB, following the +1 letter shift code.