"Why" is the question to ask to help identify the reason for an event that happens in a historical text.
If you ask "why" an event happened, you will get to better understand the reasoning around it, what prompted the event, and some of the personal/political emotions or decisions that surrounded the event.
1 Is
2 Are
3 Knows
4 Is
5 Is and is again
6 Is
7 Are
8 Are
9 Were Are
Answer:
The one about video games, the one about social media and the one about online learning.
Both the first and last one