Which of the Following Is the Best Example of a Response

Which of the following is the best example of a response when answering calls for others?

A) Annette is currently participating in an important budget meeting with our board of directors.
B) We're not really sure where Annette is right now, but she'll return your call immediately whenever she gets back.
C) Annette has run down to the ladies' room for a few minutes, but she should be back soon.
D) Annette is away from her desk, but I will give her your message when she returns.