Time to get back to Puzzling! Hangman game backward #12 - guess what the question was:
fill in "a" - In some area it proves to be a big problem to kids / teens or even adults these day, which potentially does not exists thirty something years ago.
fill in "e" - 2, 4 and 6 are the common numbers here; With 8 or more it gets a little more scary.
fill in "o" - It has different meanings - some say it's related to numbers in a different way; some said it's a variable resource; some said it's for remembering what's been done.
Again, your answer can be in the form of:
The question was: _ p p l e
First answer that fully explained each line will be accepted, enjoy!