In Of Mice and Men, by John Steinbeck, the person who seems to be a source of trouble in the chapter and may foreshadow future conflict is ?...

Lennie

Explanation:

Lennie is totally defenseless and rather petulant. He cannot avoid the dangers presented by Curley, Curley’s wife, or the world at large. His innocence raises him to a standard of pure goodness that is more poetic and literary than realistic. His enthusiasm for the vision of their future farm proves contagious as he convinces George, Candy, Crooks, and the reader that such a paradise might be possible. But he is a character whom Steinbeck sets up for disaster, a character whose innocence only seems to ensure his inevitable destruction.