Question

_______ works are often playful in spirit, a reaction against the unrelenting seriousness of much modernist art.

Answer 1

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.

Answer 2

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.