Abe has always been very involved in politics, but for the past 3 years he has lost interest and resigned from all political organizations. He also complains about being sad all the time, although he is still able to take care of himself and has not experienced any major changes in eating or sleeping. Which anxiety or mood disorder could Abe have: specific phobia, social anxiety disorder, generalized anxiety disorder, panic disorder, agoraphobia, obsessive-compulsive disorder, posttraumatic stress disorder, major depressive disorder, persistent depressive disorder, bipolar I disorder, or bipolar II disorder?