Connor Always Loved Playing Video Games with His Friends

Connor always loved playing video games with his friends. They played remotely and together whenever they could. For the last month, Connor hasn't been playing at all. He comes home from school and goes up to his room to sleep. In fact, his sleep has increased so much it seems that is all he does. He has been losing a lot of weight due to loss of appetite. He has been feeling worthless and cannot seem to concentrate when he is in school. Connor's parents should have him evaluated for ______.

A) conduct disorder
B) post-traumatic disorder
C) anxiety
D) major depressive disorder