People are more likely to stay _______ 30 miles of _______ they

People are more likely to stay _______ 30 miles of _______ they were born.
A、in … where
B、at … what
C、within … what
D、within … where
【正确答案】：D
【题目解析】：人们更可能留在他们出生30英里的地方。