Which sentence uses punctuation correctly?

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 lose my grip.

c.
i won't leave you alone, until you retreat from the edge

I believe the best answer is A - You are going to fall off the cliff unless you move back

Comment if I'm wrong please :D

with whom will you be coming to the party? this is written correctly.

first question's answer is   a. they felt bad for the kitten, and started feeling guilty for not it.

second question's answer is c. she was trying to prevent the kitten from further screaming.

third question's answer is a. the mother and aunt fran faced their fears of cats, from it.

hopefully this