Why is it important that personal data about research participants are kept within secure, confidential records?

(A) So that the participants cannot find out what has been written about them
(B) In case individuals, places or organizations can be harmed through identification or disclosure of personal information
(C) So that government officials, teachers and other people in authority can have easy access to the data
(D) To enable the researcher to track down individuals and find out more about their lives