A Researcher Poses the Hypothesis That Plants Grow Tallest Under

A researcher poses the hypothesis that plants grow tallest under a full spectrum of visible light.The researcher runs an experiment in which she plants seeds of the same plant species in pots and places different groups of pots under different lighting conditions.Group 1 receives the full spectrum of visible light, while groups 2 through 6 receive narrow ranges of visible wavelengths of light.All lighting conditions are at the same intensity.The researcher observes that the plants growing tallest are those exposed to blue light.After making these observations, which step is she most likely to carry out next?

A) Discard her original hypothesis and formulate a new one.
B) Repeat the experiment at a different level of light intensity.
C) Discard her question that asks what factors influence plant growth and why.
D) Design a follow-up experiment to change soil type and water conditions simultaneously as tests of these variables on plant growth.
E) Run a control trial to be sure that a valid conclusion can be made based on the results.