In Developmental Research, the Sample Is

In developmental research, the sample is:

A) Those individuals who are asked to participate and choose to do so
B) The entire group about which the researcher is interested, including both participants and nonparticipants in a particular study
C) The setting in which the research participants spend significant amounts of time, such as the classroom
D) A subset of research participants whose data are particularly interesting or valuable to the outcome of the study