Use the passage to answer the question. A cart from a supermarket in my neighborhood was rolling along on its own, with no one pushing it. It was a cart just like all the others, made of thick wire, with four little rubber wheels (the front pair slightly closer together, which is what gives the vehicle its characteristic shape), and a bar coated with bright red plastic for steering it around. There was nothing to distinguish it from the two hundred other carts that belonged to that enormous supermarket, the biggest and busiest in the neighborhood. Except that the cart I’m referring to was the only one that moved on its own. It did this with infinite discretion: in the tumult that reigned on the premises from opening to closing time, to say nothing of the peak hours, its movement went unnoticed. Which answer choice explains what is left uncertain in this passage? (1 point) Responses where the cart is where the cart is what type of cart is being described what type of cart is being described why the cart is able to move on its own why the cart is able to move on its own what the cart looks like
The answer choice that explains what is left uncertain in this passage is "why the cart is able to move on its own." The passage describes how the cart moves on its own discreetly, but it does not provide an explanation as to why the cart has this ability.
