Final answer:
The most correct translation is "O Fernando caminó a la oficina de correo anoche."
Step-by-step explanation:
The most correct translation of the sentence "Fernando walked to the post office last night" is:
- O Fernando caminó a la oficina de correo anoche.
This translation uses the preterite tense "caminó" which is appropriate when referring to a specific action that happened and ended in the past, like walking to the post office last night.
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