Answer:
Line graph.
Explanation:
Hello,
In this case, since you are recording the number of leaves of each test every three days for six weeks, the most suitable graph will be the line graph, as it allows you to set a unique line for each test in addition to the recording of the number of leaves on the "y" axis and the going by days on the "x" axis. An illustrative example different to what is studied here is given on the attached picture.
Best regards.
