i believe the answer is: Fuel filter
Fuel filter is a part of your vehicles that screens out various form of small particles from the fuel (such as dirts). Every 15,000 miles, there would be a chance that your fuel filter is clogged. If this fuel filter is not changed, it would be hard for you to start your car.
Answer:
Qualitative research
Explanation:
This approach is used to gain an understanding of underlying motivation, reasons, and opinions. It provides the idea or insight into the problem and to gain knowledge on the area of work related to the research topic. Qualitative research includes interviews, direct observation of the subject.
The one that is a popular music is : c. Secular music
Secular music is all the things that are not associated with religious music. Religious music seems to be not very popular in the world
hope this helps