You don't need to worry about labeling yourself if it's stressing you out this much. You of course can try to figure it out, but you really don't need to label yourself.
(I'm really sorry if this comes off as insensitive, I'll help more if you need it <3)
The rain fell, the sun shone, and the flowers began to bloom is the right answer because each phrase in that sentence is written in the same structure. Hope this helped!
I suggest either talking or emailing the person grading the exam or someone who could help you.
