A、Black. B、Brown. C、White. D、Gray. BWhat’s the color the woman chooses?

W: Good morning, I am calling to inquire about your book shelves.
M: Yes, what would you like to know?
W: Well, I’d like to check the size first.
M: The standard point is 3.2 meters wide, 1.8 meters tall and 30 centimeters deep.
W: Thanks. That is the dimensions I need.’ How about the colors?
M: We have 4 colors, white, black, brown and grey.
W: I think brown is OK, what about the charge of the delivery?
M: Well it depends on how far you are from our factory?
W: We are about 5 miles from your factory.
M: I see. That is our free delivery area.