A is an exchange of consecutive shots in badminton. A) Rally

B) Love

C) Alley

D) Match

cant see anything

explanation:

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there

answer(d) call 911;