[Q]: Which of the following solutions is better for the following goal:
To make purple food coloring, you can

[A]: Mix red and blue food coloring together to obtain purple

[Q]: Which of the following solutions is better for the following goal:
How can ropes be used for climbing trees?

[A]: Ropes can be used to climb trees by attaching the ropes to the tree and then climbing the rope by looping a coil over your foot, holding it in place with your other foot, pulling yourself upwith your arms, readjusting your feet each time you move up.

[Q]: Which of the following solutions is better for the following goal:
How to form shapes out of wood?

[A]: Scrape away at the wood with a sharp knife and then smooth the wood with sandpaper

[Q]: Which of the following solutions is better for the following goal:
How to quickly cool down coffee?

[A]:
Add an ice block made with milk into the coffee and stir