<em>Solution finder </em> fits perfectly
The answer is (C), becuse the reader does not now was is threatening the characters lives. In the other answers it told "it" was thereatening their lifes. This is why (c) has the sentence fragment.
The first answer is A
the second answer is A
the third answer is either B or D
1 is nothing can be better 2 im not really sure but 3 is he might die
The correct answer is B because a semi-colon is the best way to join the two sentences since they are both independent.
Hope this helps :)