How can a social worker determine whether a specific person is a support, a contributing factor to ...

How can a social worker determine whether a specific person is a support, a
  contributing factor to the problem, or a combination of both?
 
  a. By understanding who is no longer a friend of the client and why they are no
  longer a support to them
  b. By understanding who has hurt the client and how much of an impact that
  has had on the client
  c. By understanding who has an emotional connection to the client and how
  strong of an emotional connection it is
  d. By understanding who has influence over the client and what the nature and
  strength of that influence is