Which of the Following Closings Would Be Best in a Letter

Which of the following closings would be best in a letter to a friend and co-worker whose fiancé died in an auto accident?

A) Be patient. Time heals, and you'll be back to normal soon.
B) Again, please accept my sympathy for your loss.
C) Terry was a good friend; I don't know how I'll fill the gap.
D) Let's get together for dinner later this month and talk about the good times you, Terry, and I shared.