Works are often playful in spirit, a reaction against the unrelenting seriousness of much modernist art.
a. neoclassical
b. minimalist
c. postmodern
d. concerto

The answer is letter c. Postmodern.
postmodern works are often playful in spirit, a reaction against the unrelenting seriousness of much modernist art. Postmodern is an art the ironically and playful treat objects.

C. Postmodern

Postmodernism refers to a movement that is the reaction to modernism and its aftermath. Generally, it is an era that occurred across arts, philosophy, literature, and architecture. Although often playful in spirit, postmodern works display skepticism, moral-relativism, pluralism, and it focus on subjectivity.    

No sending a portrait in todays world would not mean the same thing. no i don't think that if the president sent his portrait it would reaffirm a relationship. todays perception of authority is anyone who can make a person do something out of force so sending a picture does not come out as authority it comes out as weak and unknowing.