Final answer:
The given statement is in the past tense.
Step-by-step explanation:
The tense of the given statement is past tense.
The verb 'pasearon' is conjugated in the past tense, indicating that the action of 'Charlie y Sophie pasearon en el parque Iguazú en Argentina' happened in the past. Other examples of past tense in Spanish include 'hablé' (I spoke) and 'comí' (I ate).
Therefore, the correct answer is O pasado.
Learn more about tense