tderz: in above diagram, White is a bit too much fixed on this whole snapback theme,
even anticipating it when not present:
after , Black was indeed threatening snapback a, if he had enough time & liberties,
however, both and have two liberties now and White has sente, thus she plays = b and captures the in time.
tderz: this is the result, hence only Black = c would be the right answer, if White was to chose as shown here.
tderz: Please notice, that there is no ko option left, as Black a, White b etc. ends in self-atari e and capture f.
However, if White (assuming an enormous ko-threat surplus) was to start with = e,
Black might chose to connect at g to remove even this remote, disadvanageous ko-aji of White.