In the Context of Order Acknowledgements, Which of the Following

In the context of order acknowledgements, which of the following illustrates the most positive way of responding to a vague order?

A) You failed to mention the number of bookcases that you need.
B) The expected delivery date was not mentioned in your order.
C) You did not specify the details of the requested products.
D) If you had specified the exact model, we would have shipped your order immediately.
E) So we can ship your order, please let us know which of the two bookcase models you would like.