Answer:B. Children's sharing behavior may improve with the simple passage of time.
Explanation:Internal and external validity makes the research trustworthy and meaningful.
Internal validity refers to when cause and effect relationship of a treatment and outcome can be trusted.Internal validity also occurs when there is no alternative explanation for a finding.
This means you have to be sure that there are no other factors in play with your research that everything is a result of what you have put to the research and nothing else.
Internal validity is then how confident one is to the result of the research.