The type of plants she used is the independent variable in this experiment. Thus option A is correct.
<h3>What are the types of variables in experiment ?</h3>
Variables can be defined as the measurable factor that compulsorily added to an experiment which can manipulate and control the research.
An independent variable can be defined as the singular characteristic which can not be influenced by other factor, Age is an independent variable.
A dependent variable can be changed by other factors like independent variable; Control variable which remain constant and show no effect on other variables, it is mainly used to prevent bias in an experiment.
Thus option A is correct.
For more details regarding variables, here
brainly.com/question/17344045
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