Dr. xong, a developmental researcher, is interested in studying the influence of video games on the moral development of children. of dr. xong wants to control the type of game the children are exposed to and how long the children play the game, he should use: naturalistic observation. laboratory research. a case study. an interview.

If Dr. Xong wants to control the type of game the children are exposed to and how long the children play the game, he should use "naturalistic observation".

Naturalistic observation is an examination strategy normally utilized by therapists and other social researchers. This method includes watching subjects in their indigenous habitat. This kind of research is regularly used in circumstances where leading lab look into is improbable, fetched restrictive or would unduly influence the subject's conduct. 

It’s actually still in the u.s.