Operationalized components of a particular theory statements best defines a construct. Thus, the correct option is A.
Operationalization is defined as the process by which researchers conducting quantitative research spell out accurately how a concept will be measured.
For example, if an unobservable theoretical construct such as socioeconomic status is refer to as the level of family income, it can be operationalized using an indicator which asks respondents the question such as what is your annual family income?
Because social science notions are rife with subjectivity and imprecision, We usually use numerous indicators to measure most of those constructs (with the exception of a few demographic constructs like age, gender, education, and income). This method allows us to analyze the accuracy of these indicators by looking at how near they are to one another (reliability).
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