In order for me to assist you, you must attach an image of the graph. :)
The answer is A. Environmental conditions are not always right to produce flowers and seeds for sexual reproduction.
Most plants are able to reproduce either way because even if the conditions aren't right for the plant, it can still make more flowers so it doesn't die out.
I hope this helps! :D
Answer:
there it is fella
i guess the hand writing is not that bad
C. decomposer
C. from other organisms
Each part at apart of the plant