Why is assessing contributing factors important to practice?

Why is assessing contributing factors important to practice?
 
  a. It is important to recognize patterns of when people are contributing to the
  clients' problems so that you can write them a letter and tell them to stop it
  b. Discussing and understanding the impact of contributing factors helps clients
  to better appreciate dysfunctional patterns and make better judgments
  c. It helps you to know who to blame for clients' problems
  d. It enables you to avoid talking about the important pieces of the work that
  enable change