Answer :
The concept of validity refers to the extent to which an empirical measure accurately reflects the real meaning of the underlying concept. Thus, option A or true is correct.
Validity is a crucial aspect of research, as it ensures that the data collected accurately represents the concept being studied. It is essential for researchers to assess the validity of their measures to ensure that their findings are meaningful and reliable. Without valid measures, the results of a study may be misleading or inaccurate, leading to flawed conclusions. Researchers often use various methods to assess the validity of their measures, such as content validity, criterion-related validity, and construct validity. By ensuring the validity of their measures, researchers can have confidence in the accuracy and relevance of their findings, ultimately contributing to the advancement of knowledge in their respective fields. Therefore, option A is correct.