A. In the end, shows that it is the ending or conclusion.
The correct answer is A. This is because the reader will learn the thoughts and feelings of all characters, not just one.
I would have to say that it would be the last sentence that has the most elements of a final summary.
Hope this helps!
I believe the correct answer is B. The modifier "wearing a blue dress" is placed far from the noun which is supposed to modify - Stacey. Such as it is, it could easily be attributed to another noun, the stage. It would seem that the stage was wearing a blue dress, rather than Stacey. This is easily fixable with a comma between "stage" and "wearing".
The C and D sentences are also a little bit awkward, but they don't contain a misplaced modifier.