I'm so confused can someone me?

brainliest + points

It woud be arrow 4. How I found this is by imagining that arrow 4 was connected to the corner of A'. Mentally I then had corner A' follow the arrow, taking the whole shape with it. Once it finished following the arrow you can see that A' and the other angles match up with ABCD. I added an image where I tried to demonstrate it, but it's a bit hard to explain.

Hope this makes sense! Let me know if you need any clarification

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.