A researcher codes the nonverbal behaviors of married couples while they are discussing child-rearing methods. The method of study used in this scenario is _____.

A) naturalistic observation
B) systematic observation
C) a survey
D) a case study

Systematic observation involves carefully observing and recording behaviors in a structured and systematic way. In this scenario, the researcher is observing and coding specific nonverbal behaviors while the couples discuss child-rearing methods, indicating a structured approach to observation. Naturalistic observation would involve observing the couples in their natural environment without attempting to control or influence the situation, while a survey would involve collecting self-reported information from the couples. A case study involves in-depth analysis of a particular individual or group, which is not what is happening in this scenario.