[Q]: Which of the following solutions is better for the following goal:
To make an invisible bookshelf.

[A]: Attach brackets to the wall the length of the stack of books.

[Q]: Which of the following solutions is better for the following goal:
how do you put deodorant on?

[A]: rub the stick along the inside of your armpit.

[Q]: Which of the following solutions is better for the following goal:
Remove unwanted paint line.

[A]: Scrape off with a razor blade.

[Q]: Which of the following solutions is better for the following goal:
Prevent fleas in house.

[A]:
Place liquid soap in bowl of water under light source to attract and drown fleas.