Choose the word which is different from the rest.

The answer is: B. Chariot

A raft is a simple watercraft made by lashing together a number of logs or other floating materials, and used for river travel or crossing.

A sledge is a vehicle on runners, used for travelling over snow or ice.

A cart is a small vehicle, typically with two wheels, used for transporting goods or people.

A chariot is a two-wheeled horse-drawn vehicle used in ancient warfare and racing.

The word that is different from the rest is chariot. This is because the other three words are all used for transportation, while a chariot is used for warfare and racing.