On arriving home, the boy told h

On arriving home, the boy told his parents about all the（）which occurred in his dormitory.

occasions

affairs

incidents 

 issues

occasions意为“场合，时机”；affairs意为“公共事务，政治事务”；accidents意为“事故”；incidents意为“发生的事(常指小事)”。句意为：一到家，那个男孩就给他父母讲述了发生在宿舍里的事情。所以C项符合句意。