Shannon is a researcher who studies sleep patterns in humans. shannon most likely uses

a) laboratory observation.
b) case studies.
c) naturalistic observation.
d) structured observation.

A- laboratory observation

Explanation:

Laboratory observation, as opposed to naturalistic observation, refers to observing the behavior of subjects that are in a controlled environment. Because of the controlled environment variable factors can be controlled which therefore leads to a limited number of possible responses.

i think it's b or c hope this