Why did Confucius disapprove of Yan Hui’s visit to the State of Wei?

A、He was clear that Yan Hui went there for the purpose of fame;
B、He was concerned that if Yan Hui might get killed by the cruel king;
C、He was not satisfied with Yan Hui for he hadn’t learned well;
D、He was not sure whether Yan Hui would be able to fulfill his purpose