Bonjour
Some more precision ►
1- On s'est parlé il y a trois mois.
You did it correct ==> we talk to each other for th 1st time 3 months "ago"
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2- Mon film préféré est sorti depuis 5 ans.
you answer is incorrect ==> My favorite movie has been released since 5 years.
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3- Après s'être cassé le bras, il n'a pas pu jouer pendant six mois.
you're right => he couldn't play "during" 6 month.
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Step-by-step explanation
il y a = ago. Indicate a precise moment of the past for a completed action
pendant = during. The complete duration of the action and completed by the time one speaks
depuis = since. indicates the moment of the beginning of an action which still last when we're talking
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hope this helps ☺☺☺