10 класс. Английский язык. ЛЕКСИКА. Real life vocabulary

I am a smaller vehicle that picks up people and drives them around town. Everyone has to pay me in order to get a ride and I measure the distance with a metered device that calculates a cost per kilometer traveled. I'm usually found in larger cities and you can see my sign on my roof. I'm also called a cab. What am I? ..........

• A trailer
• A taxi
• A boat
• A train