Dexter Needs to Write a Message Refusing a Request for the Use

Dexter needs to write a message refusing a request for the use of a company's garden space for a photo shoot. Which of the following is the best way to begin?

A) We have already rented the space to another group for the month.
B) We wish we could help you because the arts are important.
C) This is to inform you that company property cannot be used for your purpose.
D) Thank you for letting us know about your interest in our garden facility.
E) Although we would like to grant your request, we are not able to do so at this time.