【正确答案】 C

【答案解析】[解析] 细节题。Mary要跟祖母到新泽西去看望父母，所以答案为C。
[听力原文]
M: Hello, Mary. I hear you're going to the United States.
W: Yes. I'm going with my grandma. We're going to see my parents in New Jersey.
M: When are you leaving, then?
W: This Friday evening, our plane leaves at seven fifteen.
M: Oh, great!