What is not an advantage of observation as a research method?
A. The obtained data are generally reliable and free of respondent bias.
B. It is relatively easy to note the effects of environmental influences on specific outcomes.
C. It is easy to observe certain groups or individuals from whom it may be otherwise difficult to obtain information.
D. It is a cheap and fast way to collect information.
Answer: D. It is a cheap and fast way to collect information.