To answer the question first of all we should know what is lurking variable.
Lurking variable : A lurking variable is the variable that is unknown and not controlled for. It has an significant effect on variable of interest. Lurking variables are extraneous variables, but because of lurking variable we can have a different relationship between independent variable and dependent variable than the relationship actually is.
And to control the lurking variable we need to conduct an experiment.
Hence, for the given scenario, option (E) is correct.
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