Every Time Dan Arrives at His Therapist's Office for a Session

Every time Dan arrives at his therapist's office for a session, it seems his therapist is running late because the previous client seems to need extra time at the end of his sessions. Dan is livid and complains quite loudly that he is angry and wants to know why she is always running late for her appointments. You can assume that

A) he is simply manifesting transference and this needs to be processed with Dan.
B) he is exhibiting an irrational response triggered from a past situation.
C) his anger could be a justifiable reaction.
D) Dan is self-centered and wants immediate attention upon his arrival to the office.