Answer: a) Status distinctions
Step-by-step explanation:
According to theory of Max Weber, status distinction is the property through which social class or status of people can be differentiated and determined in a society.This can defined on basis of factors like wealth honor, ethics, race,power, prestige etc.
Therefore, social status of Andrew and Louis can be determined through status distinction which would includes their family background, wealth, work etc.
Other options are incorrect because class differentiation, age factor and ethics are not the measurement unit in defining social status and class of any individual. Thus, the correct option is option(a).