The correct answer is: A. Ship.
A sailor is a person who travels by ship. A journey is a trip or voyage from one place to another. A ship is a large boat that can carry people or cargo over long distances.
The other options are not as closely related to sailor as ship. A crew is a group of people who work on a ship. Water is the liquid that covers most of the Earth’s surface. A voyage is a long journey by sea. A navy is a group of ships that are used for war.
Here is a table that shows the relationships between the words in the question:
| Word | Related to |
|—|—|
| Traveller | Journey |
| Sailor | Ship |
| Ship | Crew |
| Water | Voyage |
| Voyage | Navy |
As you can see, the word “ship” is the most closely related to the word “sailor”. This is because a sailor is a person who travels by ship.