The correct answer is 'because she moved to the city.'Key Points- Let us look at the usage of the given options: - For: used to talk about a purpose or a reason for something. - Example: I'm going for some breakfast. - As long as: used to refer to the intended duration of a plan or idea, most commonly referring to the future. - Example: I'll remember that film as long as I live. - No sooner than: used to show that one thing happens immediately after another thing.- Example: They had no sooner arrived than they were arguing. - Because: used when we are focusing on the reason. - Correct sentence: I stopped seeing her because she moved to the city.