Answer:
Im not a expert in this but the answer looks like its C
Explanation:
It looks like the right answer because it is in the middle of 3 and 9. Hope I could help and have a nice day
A is your answer
1-3:light
4-6:dark
7-9:light
BTW WHERE IS THE DIAGRAM
HAVE A NICE DAY
Is ther supposed to be a list or a picture ?