With this image in mind, consider that Diego Rivera was a Socialist, and he believed that the strength of any nation lies in its workers--like his large blue-collar worker--not in the wealthy classes that employ workers. Considering this image together with its historical context, if you were going to conduct research on this wall painting, the most appropriate methodology to use would be:

a. Formalism
b. Psychoanalysis / Freudian Theory
c. Marxism
d. Feminism