The most likely outcomes are one and two. Three is plausible, however it’s not likely that a single word would make the entire piece of writing sound as though it was written by an uneducated person.
Explanation:
In the slave societies of the Americas, a quadroon or quarteron was a person with one quarter African and three quarters European ancestry (or in Australia, one quarter aboriginal ancestry).
"If you can’t fly, then run, If you can’t run, then walk, If you can’t walk, then crawl, but whatever you do, you have to keep moving forward." - Martin Luther King Jr.
The correct answer is simple sentence. It is a type of a sentence called elliptical sentence, and can stand on its own while still conveying meaning. Similar situation to this would be "Fire!" or "Look out!".
