设X→Y是一个函数依赖，且对于任何X'∈X，X'→Y都不成立，则称X→Y是一个 ________。

A) 完全函数依赖
B) 部分函数依赖
C) 平凡函数依赖
D) 非平凡函数依赖

A: Could I invite my friends to my house for the Dragon Boat Festival, Mom
B: (76) . That sounds like fun.
A: Yeah. Ummm...Could I borrow some money
B: (77)
A: I need to buy some ingredients to make Zongzi.
B: I’m going to the supermarket and I can buy what you need.
A: (78) .
B: You’re welcome. Oh, could you clean your room
A: (79)
B: You need to clean it again for your friends.
A: OK, Dave is coming early. (80) .
B: All right. By the way, do you know how to make Zongzi Maybe we can make Zongzi together. And then we can give some to your grandparents as well.
A: Perfect.