Read the following selection from the section "Scientists Debate The Findings." He said that this is correlational data. This means that the two kinds of data in the research - emotional well-being and video game playtime are related in a specific way. But that does not necessarily mean playing games causes emotional well-being.

Why did the author include this idea?

A. To explain one of the key limitations of the study.

B. To show that people who play video games are happier than those who do not.

C. To explain why the data from the study is unreliable.

D. To show that some games might have a greater effect on well-being than others.