Problem: Mark is a 38-year-old male who is obsessed with cleanliness and control, especially in terms of how is apartment and work areas look, are set-up, and organized. He is so concerned that he will take hours 'fixing' his area if someone comes in and changes anything, ignoring everyone around him until everything is back to how he wants it. According to Freud, Mark likely had difficulty during which stage of psychosexual development?
a. anal stage
b. gentital stage
c. oral stage
d. latency stage
e. phallic stage