Step 1: Identify the mood.
The verb “pido” (I ask) expresses a request or desire, which requires the present subjunctive form in the subordinate clause after “que.”
Step 2: Conjugation.
The verb “callar” (to be quiet) in present subjunctive for “vosotros” (you all) is calléis.
Thus:
Os pido que os calléis ya. (“I ask you all to be quiet now.”)
Step 3: Analysis of options.
- (1) calláis → present indicative; not used after verbs of request.
- (2) calléis → correct; present subjunctive form.
- (3) callasteis → preterite; refers to the past, not suitable here.
- (4) calleses → incorrect form (non-existent).
Step 4: Conclusion.
Therefore, the correct answer is calléis.