Which sentence contains the adverb clause that is not correctly punctuated?
A: You are going to fall off the cliff, unless you move back.
B: I wore my special hiking boots so that I would not loose my grip.
C: I won't leave you alone until you retreat from the edge.
D: Because I have glued my feet to the asphalt, I am fearless.

PLEASE HELP ASAP. Explanation would be GREATLY appreciated. :)
Brainiest Answer Is rewarded :)