The mexican was intended to address mexico's need for a national and revolutionary art.

The answer is

Mexican Muralism

Explanation:

Mexican muralism was a movement and promotion of mural painting starting in the 1920s with social and political messages as part of efforts to unite the country under the post Mexican Revolution government. It was headed by “the big three” painters, Diego Rivera, José Clemente Orozco and David Alfaro Siqueiros.

b.) a 3-d model

the answer is counterpoint.

counterpoint definition: "the art or technique of playing a melody or melodies in conjunction with another, according to fixed rules."

counterpoint is present in a lot of baroque music- such as bach (notably his wtc prelude and fugues) and scarlatti, but can also be found in music by mozart, beethoven. it can even be found in music as modern as john williams!