Answer: Option 1 is recommended by me
Answer: If his plan is going to work.
Explanation: Clearly Jack is using STEM for his plan so making sure that his plan works could possibly be the answer. I mean if you were creating a project you would want to make sure that it works and that you checked your STEM skills to go forward with the plan.
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.
