Change "Unhelpful" to "Destructive" is your answer to this question
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
Answer: Me and my family were sitting on the couch, when our outside cat climber the door to its window. I get up to shoe it away, when I look at the window I wasn't prepared for the cat to be in the spot I thought it was. Gave me a heart attack.