Some research has found that children from different cultures have a different percentage of kids who have the three temperamental styles. for example, chinese american babies have been found to generally be calmer than european american infants. one possible explanation for this difference is the presence of different intrauterine exposure to hormones. this demonstrates the principle of

Ruling Out Rival Hypotheses

Explanation:

Ruling Out Rival Hypotheses – There are times where one explanation is not enough to make conclusion and in this case there may be other explanation which may require that researchers do additional research to get rid of these other many explanations .Ruling out rival hypothesis: is then a principle which states that when there is a situation that we need to define or determine the question that one should ask is whether they have exhausted all other possible explanations regarding that issue in question.

i think it is the third one.

answer; legislative branch;