Explanation:
A. Requiring a password to open the document : Passwords entirely deals with technology and it will help us to protect the document from unauthorized access. But here we talk about the trust worth. Hence it is invalid.
B. Getting information from reliable sources : This is the right answer. Getting details from reliable sources will ensure that the documents are trust worthy.
C. Putting the decision-related information first : This does not deals with trust.
D. Using a wide variety of charts and tables: Charts and tables are used to represent data in an efficient manner. But it does not talk about trust worthy.