I have decided to apply to one more school on the last minute. Two of my recommendation letter writers are quite available, but one of them hasn't responded my email yet. I know he should be traveling with his family right now and he will be back when the winter break ends. He has been always very nice and supportive to me and I believe accepts my request when he reads my email.
Since the deadline is next week and time is running out, I was wondering if I should:
A. Put his name on application form and submit my application with the hope that he will be okay with one more letter when he is back.
B. Ask someone else whose letter won't really add strength to my application to write this urgent letter.
C. Wait for him until the deadline day and if he doesn't respond, forget this last application.
What do you think guys? Any suggestions would be appreciated!