游乐园上午有游客752人，中午有386人离去，下午又来了122人，这时游乐园内有多少游客？

—I'm a teenager's mother. Sometimes I don't know _____.         

—Love and understanding.        

A. what my son needs most            

B. what does my son want to get

C. why my son gets annoyed very often  

D. why does my son get annoyed very often