The correct answer is Comma because a coordinating conjunction isn't needed after a semicolon and a colon indicates a list and a dash id for breaking up a word or numbers like twenty-two or in-dex
The fourth line I think. Hope this helps!
Yes indeed good sir you are correct
If you're meaning just a sentence with these two words, then:
She approached the significant hole in the wall, peering through it, a soft sigh of defeat passing her lips when she saw that the impenetrable vault she was meant to go wasn't there.
That help any?