Respuesta :
The purpose or the benefit for implementing the control in the design of the experiment should be option B and option D.
What is the control in experimental design?
At the time of conducting an experiment, the control refer to an elements where it should not be changed or not be impacted by the other variables.
It is used like the benchmark or the comparsion point where the other test result should be determined.
Moreover, there is no benefit and we remove the requirement of the control group.
Hence, the option b and option d is correct.
Learn more about experiment here; https://brainly.com/question/9882283