Choose the word which is different from the rest.

The answer is B. Phaeton.

A taxi is a motor vehicle for hire, especially one that is summoned to a particular location by a customer. A cart is a small vehicle, typically without a roof, drawn by one or more animals. A rickshaw is a small vehicle, typically pulled by one person, used for transporting passengers or goods. A tonga is a light two-wheeled carriage drawn by one or two horses.

A phaeton is a light four-wheeled horse-drawn carriage, typically with a folding top. It was popular in the 19th century.

The phaeton is different from the other options because it is a horse-drawn carriage, while the others are all motor vehicles.