In this quiz question, it looks like both the second and third options will be correct. Is this the case? Thanks.
Here you need to bear in mind that the verb is agreeing with what comes after (the subject in the passive sentence). In this case, we are talking about windows, in plural, so the verb needs the plural form "abran":
ábranse las ventanas
ábrase la ventana
I hope it clarifies it.
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