Answer:
In this excerpt from A Cub Pilot, Twain's use of the word orphan affects the memoir by conveying the reader how he feels alone, with no one looking out for him. The correct answer is the third one.
Step-by-step explanation:
I chose this answer because, although the excerpt itself doesn't say anything literal about it, the use of the word orphan gives a sensation of sadness, of loneliness. Twain doesn't say anything to the others, but the connotation of the word orphan is not a happy one; it gives the reader the feeling of Twain being lonely, with no one near, maybe of him feeling an outsider.