— My mother is preparing my favorite dishes. Go with me and have a taste, okay
— （）. And I'll be glad to meet your parents.

A. I think so

B. I'd love to

C. I'm sure

D. I hope so

设关系R与S具有相同的目，且对应的属性的取值来自同一个域，则t\t∈R∧t∈ S，t是元组的变量，其结果关系是( )。

A．R∪S

B．R-S

C．R∩S

D．R-(R-S)