Based on the experiment in the scenario, which visual aid would be most in showing the change in plants’ height overtime?

Option C, Bar graph

Explanation:

A bar graph is used to graphically represent a comparative data set where data belonging to different categories is presented.  

Here the different categories shall consists of  "different environment exposure" given to plant and under all the “exposed environmental condition” the growth of plant is compared. The categories can be kept on both horizontal and vertical axis of the graph.

Thus, a bar graph (either vertical or horizontal) would be the best to present this data set.

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