Select the option that expresses the given sentence in passive voice.
Someone stole his traveller's cheques when he was travelling in Europe.

A

His traveller's cheques are stole when he was travelling in Europe.

B

Someone had been stole his traveller's cheques when he was travelling in Europe.

C

His traveller's cheques was stole when he was travelling in Europe.

D

His traveller's cheques were stolen when he was travelling in Europe.