All of these sentences, especially "<span>C. Gail fell down the steps because she tripped on her untied shoelace" use the word "down" as an adverb since they all use "down" to describe the direction of the fall. </span>
C the speaker suggests that humans like trees must give freely to thrive
I believe it would be <span>C) She stood before the mirror courtesying and simpering to her own image, and greeting it as the friend whom she loved better than all the world beside. </span>
It is called the confloct