How did the researcher get most of their dataA．By

单项选择题

Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following five questions.
Now listen to the interview.

How did the researcher get most of their data

A．By asking students to do questionnaires.
B．Through giving each students a programmable paper for a week.
C．Through interviews.
D．Through recording students’ acfvities.