A. building tables,
because I'm not sure how that will exactly help you in studying. However, in my opinion, the other three seem able to work.
Sorry if this answer is kind of late, but this is the first time in ages since I've logged on. Have a good night and life though! :3
Both of them are still being viewed whether its digital or in real life
This d and this d this d and long shling
answer is having to gone out of this world but im sorry if im wrong
