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>
The only noun among these examples is C, love.
A is a conjunction.
B is an adverb.
D is an adjective.
Use transition words to make your writing flow
It's A, A simile. I hope i helped you