Ye Olde Burning Bush

Greetings from Dahab. I am suffering greatly here, which means that my posting activity is at a minimum. Until I catch you up with the rest of Cairo and the Sinai Peninsula, I offer you a little quiz for your entertainment (and mine). No cheating allowed!

We visited Saint Katherine's Monastery today, where the reputed descendant of the burning bush lies within its walls. Sure, we were a bit delirious after our mountain climbing adventures, but it still took a bit of poking around to figure out which bush was supposed to have burned (without burning). 

Which of these do you think is the Burning Bush?

Bush A

Bush B

Bush C

Bush D

Yes I know, they are all equally impressive.