Nobody can answer this question because there isn't a passage for us to read, but I can give you a hint; when do the words in the story change from he,her, and they to me,myself, and I? That should give you your answer. Have a great day
I would say that the passage which best suggests an indirect cause is B) Jack slew the giant because he sold the cow for magic beans.
Him selling the cow wasn't the direct cause for him killing the giant, but it happened indirectly.
