Question:
Goal: blade

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
can cut watermelon

Question:
Goal: How do I send an SOS signal from a distant location?

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
Rub two sticks together to make a fire and send smoke signals.

Question:
Goal: Paint a wall without painting baseboards

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
Apply blue painters tape to the top edge of the baseboard and paint the wall above it, remove the tape when finished.