Final answer:
Andrew is likely to be diagnosed with 'C) Obsessive-compulsive disorder' due to his persistent difficulty discarding possessions and the anxiety caused by the thought of parting with them, suggesting hoarding behaviors.
Step-by-step explanation:
Based on the information provided, Andrew exhibits characteristics that are commonly associated with hoarding disorder. He has persistent difficulty discarding or parting with possessions, regardless of their actual value. This is evidenced by his anxiety at the thought of getting rid of items he owns. Hoarding disorder is recognized as a distinct psychiatric condition that is often associated with obsessive-compulsive disorder (OCD). Since one of the options given fits Andrew's symptoms closely, he would likely be diagnosed with 'C) Obsessive-compulsive disorder', particularly if his behaviors are causing him distress or impairing his functioning in daily life, which appears to be the case with the clutter in his home.