Respuesta :
Base on the question that states and ask to choose among the following choices that states the reason for the preferences base on the said question. In my own opinion, I would say that the answer would be letter B. Observational studies and survey usually do not provide results that are as accurate as experimental results.
Answer:
Option B is correct answer.
Step-by-step explanation:
Observational studies is when the researcher observes the effect of a study or diagnostic test without trying to manipulate the subjects(people who are and who are not exposed to this study)
And experimental study is when the researcher artificially manipulates the subjects based on some parameter.
Hence, option B is the answer - Observational studies and surveys usually do not provide results that are as accurate as experimental results.