Answer:
The correct answer is C. Surveys allow students to answer the questions in private and assure the confidentiality of their responses.
Step-by-step explanation:
Surveys are a great way of ensuring the student's confidentiality and provides a secure environment for him/her to answer truthfully about more sensitive subjects. During an interview there is a bigger probability of giving a wrong answer since there can be certain fear of what the interviewer might think. The survey assures one's anonymity.