Sanjiv and Robert both graduated from the same university. Sanjiv completed a bachelor's degree in chemistry and Robert completed a bachelor's degree in computer programming. Despite studying in different programs, their human capital is equal in the labor market. According to __________, this similarity in human capital defines Sanjiv and Robert as being members of the same economic class. a. Otis Dudley Duncan b. Vilfredo Pareto c. Max Weber d. Karl Marx