Why might the researcher have chosen to perform an observational study (by gathering information about participants' current behaviors) and not a randomized experiment (by assigning participants to either the vegetarian or meat-eating group at random)? Choose the best answer from the choices below. In a randomized experiment, it could be that some participants who do not eat meat would be assigned to the meat-eating group, meaning that they'd be forced to eat meat. It would not be ethical to force people to eat meat. For a randomized experiment to be performed, the researcher must ask people in the population to volunteer to take part. This would mean that there would not be any chance to include vegetarians in the sample. An observational study should always be performed instead of a randomized experiment, so that the researcher can control the number of groups, the sizes of the groups, and which types of participants are in each group