The answer is C, I believe. Hope this helps!
You could infer that they lost there keys. (B.
The climate was pleasant and cozy, it brought a pure breathable and inspiring air, probably because of the amount of exuberant, admirable and beautiful vegetation, which filled the place with a mastery capable of surprising the most emotionless of the creatures. With the presence of large fruit trees, we were able to delight in all the wonders that this garden offered, in addition to enjoying the most delicious aroma of flowers that presented themselves with the most varied species: roses, orchids, daisies, violets, chrysanthemums, jasmine and so many others that have equal beauty and aroma. It was totally possible to sit on one of the benches left by some parts and enjoy the scenery, write poems, paint pictures, or just get inspired and be influenced by the power of nature.
The three basic parts of an essay would be Introduction, Body, and Conclusion. If that it is not an answer choice it is thesis, plot, and conclusion.
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.
