Read the scenario: You get in your car to drive to class. You turn the key, and the engine starts making a clicking sound, but does not start $(1).$ You think to yourself, "The battery must be dead" $(2).$ So$,$ you borrow the battery from your neighbor's car $($with permission, of course$)$ and exchange it for the one in your car $(3).$ You figure that if the battery in your car is dead and you replace it then the car will start $(4).$ You get in the car again, turn the key, and the car starts right up $(5),$ and you make it to class on time.

Notice that there are numbers at the end or parts of some of the sentences in the scenario. Refer to these numbers when answering the question.

Which sentence, or part of a sentence, in the story is a hypothesis?