Which of the Following Is an Advantage Typically Associated with Direct

Which of the following is an advantage typically associated with direct observation?

A) They provide an opportunity to observe natural behaviors in context as they occur.
B) They are very cost effective as the researcher himself can conduct the survey.
C) They are much less time consuming compared to other research methods.
D) They allow the researcher to conduct the survey without the prior knowledge of the subject.
E) They ensure that the identity of the subject is not revealed to the researcher.