An adult man who is homeless has presented to a shelter for the first time during a summer heat ...

An adult man who is homeless has presented to a shelter for the first time during a summer heat wave.
 
  The nurse who works in conjunction with the shelter observes that the man is showing clear signs of delusions and paranoid thinking. What variable will have the greatest effect on whether the nurse is able to meet this client's mental health needs?
  A) The evidence base that underlies the nurse's chosen interventions
  B) The amount of peer support that the client is able to mobilize
  C) The quality of the relationship that the nurse is able to establish with the client
  D) The systems that are in place at the shelter to facilitate education