How did the mexican revolution affect the subject matter of mexican muralists?

The Mexican Revolution was a social development coordinated against a primitive framework that had gone on for a considerable length of time; like its partners in Russia and China, it powered national and social estimations among specialists of the post-progressive circumstances. David Siqueiros, Diego Rivera and Jose Clemente Orozco (1883-1949) were among the most essential and compelling muralists at the time, having the social transformation and Marxist beliefs, as a focal topic among their works.

Ithink the answer is b.)