According to the Textbook, Research Participants ________

According to the textbook, research participants ________.

A) are usually involuntary subjects who are observed covertly in their social settings by researchers
B) are people who voluntarily welcome researchers to interview them, or join them in their social setting
C) include anyone who is involved in social research (such as researchers, research assistants, respondents, etc.)
D) only include those people who take part in experiments in laboratories