The correct option is D ticket collector. A ticket collector is a person who checks that the passengers on the train have a valid ticket.
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In Britian, we call them train drivers. In America, they are engineers or railroad engineers. They've also been called engine drivers and locomotive engineers, in the past in different places.
A conductor's punch cancelled the passenger's ticket stub and also cancelled the main portion of the ticket retained by the conductor. Each conductor had his own punch, which made a specifically shaped hole. The hole shape differed from punch to punch.