阅读下列短文，从每小题的三个选项中选出最佳选项。

    Hello, I'm Ann. This is my family. There are five people in my family. My grandparents are old. They are teachers. My father is tall. He has a white shirt. He is a fireman. He is not afraid of fire. He can help people. He likes his job. My mother is tall and beautiful. She has long hair. She has a yellow skirt. She is a nurse. I don't have any aunts. What about you?

如果x和y成正比例关系，当x=16时，y=0.8；当x=10时，y是多少？如果x和y成反比例关系，当x=16时，y=0.8；当x=10时，y是多少？