The questions of whether a measure that is devised for a concept really does reflect the concept that it is supposed to be denoting, relates to

Correct option is A

The question of whether a measure devised for a concept truly reflects the concept it is intended to denote is directly related to "Measurement validity." Measurement validity, also known as construct validity, refers to the degree to which a test measures what it claims, or purports, to be measuring. In simple terms, it ensures that the method of measurement matches the concept being measured.
Information booster: The other options, ecological validity, internal validity, and external validity, relate to different aspects of validity in research. Ecological validity concerns how well findings generalize to real-world settings, internal validity addresses the rigor with which a study is conducted, and external validity pertains to the extent to which findings can be generalized beyond the study's sample.