Rule reminder
An implicit causal clause can be expressed with a PAST PARTICIPLE (participio passato assoluto) at the start of the sentence: 'Stancato dal lavoro, andò a dormire' (= Poiché era stancato dal lavoro...). This construction requires that the participle's subject is the SAME as the main clause subject. The participle agrees with that subject in gender and number. This is a hallmark of formal and literary Italian.
Which sentence correctly uses a past participle to express cause?