Which of the following statements about the demand space curve are true?
选项：

A:The spatial change of demand space curve can reflect the structure of retail location space in the city to some extent.
B:The demand space curve changes gently, which reflects that retail location has a strong spatial agglomeration.
C:If the demand space curve changes steeply, the retail location tends to disperse.
D:Demand space curve is independent of retail location.