Question

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Explanation:

We need to choose the correct verb form for the subject "miles de personas" (thousands of people) in the sentence about the Viernes Santo procession. The verb "participar" in the imperfect tense for the third - person plural (ellos/ellas) is "participaban". Let's analyze each option:

• Option A: "participaba" is the first - person singular or third - person singular (él/ella) form of the imperfect tense. Since our subject is plural, this is incorrect.
• Option B: "participabas" is the second - person singular (tú) form of the imperfect tense. It doesn't match our plural subject, so it's incorrect.
• Option C: "participa" is the present - tense third - person singular form. The context of the sentence (a past event, the procession) requires the imperfect tense, so this is incorrect.
• Option D: "participaban" is the correct imperfect - tense form for the third - person plural, which matches our subject "miles de personas".

Answer:

D. participaban