Respuesta :
It really is between C.or D. I say it is D. because you need the experimental subjects in the best condition possible to get the best results.
Good and reliable data.
- To do a research it is important to have a good and reliable data.
- A research cannot be continue without any good and reliable data.
What is an experiment?
- An experiment is an investigation in which a hypothesis is scientifically tested.
- In an experiment, an independent variable is manipulated and the dependent variable is measured.
- An advantage is that experiments should be objective.
- One researchers often use to determine if changes in one variable might lead to changes in another variable.
- An experiment is a set of actions and observations, performed in the context of solving a particular problem or question, to support or falsify a hypothesis or research concerning phenomena.
To know more about experiment here
https://brainly.com/question/11256472
#SPJ2