Answer:
Well i finally found my 7th grade mathbook when it all clicked in! I felt like i was in 7th grade again oof k enough of me.
Plant B has a proportional relation ship because when you divide
18÷ 1
36÷2
54÷3
they are all 18 therefore Plant B has a proportional relationship
Plant A is not proportional because
when you divide
18÷ 1
36÷ 2
56÷ 3
the first two answers are 18 but the last one is 18.6666 repeating or which is equal to 19 when you round it so thats not proportional
in order for them to be all proportional they all have to have the same answer
I hope you understand this :)