Select the option that expresses the given sentence in passive voice.
Someone stole his traveller's cheques when he was travelling in Europe.
1
His traveller's cheques was stole when he was travelling in Europe.
2
Someone had been stole his traveller's cheques when he was travelling in Europe.
3
His traveller's cheques were stolen when he was travelling in Europe.
4
His traveller's cheques are stole when he was travelling in Europe.