If a researcher finds that room color influences mood of the adults in a sample, then the researcher would like to conclude that room color affects the mood of ___

Adults in general

Explanation:

If a researcher finds that room color influences mood of the adults in a sample, then the researcher would like to conclude that room color affects the mood of adults in general. The study is specific to adults and as such the results of the study should be applied to adults. The sample which consist of adults is a representation of the general population of adults and hence the results should be applied to adults in general. But if for example, the sample was made up of children, then the result should be applied to children.

the answer might be either a or c. can't be too sure , because i searched the web, but no valid answers came through.