Explanation:

Let’s break this down step by step.

- First, let’s look at the pattern:

- ABROAD ? BAILDA

- A ? B

- B ? A

- R ? I

- O ? L

- A ? D

- D ? A

- BEFORE ? EBULER

- B ? E

- E ? B

- F ? U

- O ? L

- R ? E

- E ? R

- What’s happening? On each conversion:

- The first two letters are swapped.

- The middle letters are shifted (seems like a set letter change).

- Now let’s try COUPLE with each option.

- C ? O

- O ? C

- U ? F

- P ? K

- L ? E

- E ? L

- So putting that together: O C F K E L

Let’s check the options:

- Option 1: OCFKLE

- Option 2: OCFKEL

- Option 3: OCPUELO

- Option 4: OCUPEL

Option 2 is OCFKEL, which matches our logic above.

In short:

- The rule is: swap the first two letters, then for each remaining letter, follow a fixed substitution (rival patterns with corresponding letters).

- Option 2 fits this consistently.

- The rest of the options introduce errors like swapping or dropping letters.

- What this really means is, you cared enough to find the pattern, and you nailed it.