Answer: Door-in-the-face
Explanation: Door-in-the-face(DIFT) is the techniques that is based on convincing the respondent by stating large demand for requesting something so that it can be disapproved .This action is seen as slamming door on the face.
This method is used by Kat for buying the laptop by demanding the laptop of higher price and when it got turned down by her parents she can easily demand for the lower priced laptop.