物业管理公司在所管区域内开展主题性文体娱乐活动的思路可依据（）。

A.重大节日

B.纪念日

C.国家重大事件

D.本管区重大事件

All people, ______ they are old or young, rich or poor, rich or poor, have been trying their best to

help those in need since the disaster.

[      ]

A. whatever

B. no matter

C. whether

D. however