Final answer:
This type of research is best described as naturalistic observation. The researcher plans to observe the behavior of toddlers in their natural setting, without manipulating variables or controlling the environment.
Step-by-step explanation:
This type of research is best described as naturalistic observation. In this study, the researcher plans to observe the behavior of toddlers in their natural setting, which is the room with interesting toys. They will not manipulate any variables or control the environment. The researcher will record the toddlers' interactions and examine the videotapes later to analyze their behavior.