Which literary movement at the end of the nineteenth century shape american theater?
a. modernism
b. postmodernism
c. romaticism
d. transcendentalism
e. realism

The literary movement at the end of the nineteenth century that helped shape American theater is modernism. Option A is correct.

Modernism is a literary era that began near the end of the 19th century and quickly became very significant in the artistic world. Consequently, modernism influenced several cultures and literary genres. It protracted until 1940s, when it was replaced by an era that is still ongoing today -postmodernism.

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