Question:
Goal: how do you light up a christmas tree?

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
place string lights wrapped around the tree, and plug them into an outlet.

Question:
Goal: How to Kill Green Hair Algae in a Freshwater Aquarium

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
To quickly kill green hair algae in an aquarium, you can spot treat with 3% Hydrogen peroxide, around 1mL per 10g water volume. Turn off the filters, and fill a syringe with the peroxide. Spray directly on the algae. Leave the filters off for about 15 minutes, do a 25% water change, and turn the filters back on. You should notice the algae starting to turn reddish or brown by the next day. Repeat as necessary.

Question:
Goal: Paint a design on a glass or cup.

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
Use acrylic glass paint for the most durable result. Unless it specifically instructs you to, you won't need to cure it after painting, just let it dry as you would a canvas. The paint will last a long time but don't use a scrub brush on it or the paint may begin to wear off.