Source is author can use to research and develop ideas in an informational text.
a: autobiographical paper
b: outside publication
c: personal opinion
d: social network

According to the excerpt above, the correct answer to fullfil the incomplete sentence is letter B. “Source is an outside publication that an author can use to research and develop ideas in an informational text”. A source can be any specific publication or other type of media where specific information was obtained. These are usually included in footnotes, endnotes or any other bibliographical text; and also can be people.

(you didn't attach a copy of the poem, but i'm answering as best as i can)

since a simile compares two unlike things using like or as, it kind of gives an item the ability to do something it can't.

example: "the player was like a tiger on the field"

in this sentence, the simile conveys the idea that the player was fast and strong, like a tiger.