Which of the Following Statements Is True of the Differentiation

Which of the following statements is true of the differentiation phase?

A) it occurs when the conflict is brought out into the open
B) it is the event one person sees as starting the conflict
C) it is when the conflict is the least evident to other people
D) it is when other people tell you that your friend has been talking about you behind your back
E) it can last anywhere from a few minutes to a few weeks