Our restaurant is open to everyone ______age, sex or educational

Our restaurant is open to everyone ______age, sex or educational background.
A、disregard
B、despite
C、regardless of
D、no matter
【正确答案】：C
【题目解析】：Regardless of介词，“不管，不顾，不理会”，为固定搭配。Disregard动词，“不理会，不顾，漠视”。 Despite介词，“尽管，虽然”。