Answer:
Plant A is the control group.
Explanation:
Because it isn't being tested on, its the base for the experiment, something to compare the plants being tested on too.
D) <em><u>a beneficial mutation that increased survival of certain plants that reproduced and passed the mutated gene to offspring.
Hope this helped! xD</u></em>
The correct answer is D. It kinda makes since although it could be B, I would go with D let me know if correct.