Halina Has Received a Customer Inquiry Asking About the Availability

Halina has received a customer inquiry asking about the availability of her hotel's penthouse suite on April 5th. She has determined that the suite is available, and is composing a response for the customer. Which of the following openings should Halina use?

A) I have received your message dated April 5, in which you ask...
B) Thank you for your message dated April 5.
C) Thank you for your inquiry about our penthouse suite.
D) We appreciate you contacting our hotel.
E) Yes, our penthouse suite is available on April 5th.