Question:
Goal: screw

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
hold parts together

Question:
Goal: To prevent pen ink from drying out in the tip of a pen,

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
secure the pen lid over the tip of the pen when the pen is not being used to write.

Question:
Goal: How can I figure out if something is economical?

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
Look up its effect on your wallet, as well as the nessary materials to build it.