Which One of the Following Is the Best Example of Qualitative

Which one of the following is the best example of qualitative research?

A) Comparing average achievement test scores for students at three different schools
B) Finding out how long it takes 6-year-olds to assemble challenging picture puzzles
C) Interviewing adolescents about the nature of their relationships with other students
D) Examining the number of days students were absent from school to identify potential school dropouts