Over the weekend I had thought about writing a whole post about the events of Saturday . They can be summed up in a paragraph though . I went to the library and put my car in the shop . The car needs to go back this Saturday so that they can finish the work since they had to order a part .
According to the above context, choose the best option to answer the following question.
Question: Why do they need to take their car back to the shop ?
Options:
- They have been unable to drive their car until it 's fixed .
 - None of the above choices .
 - They needed to pay them for the other repairs .
 - Their car is unable to function properly without the new part .


Their car is unable to function properly without the new part .