Answer:
1st answer: Plant B. 2nd answer: Plant C.
Step-by-step explanation:
All you have to do is look at the points 30 days and 80 days at the bottom of the chart.
Follow that line up, and see which plant is the highest up (producing the most).
After 30 days, plant B is the highest, and after 80 days, plant C is the highest.
