This excerpt uses dialect, which is a characteristic of which American literary style:

A) Modernism

B) Puritanism

C) Regionalism

D) Transcendentalism

its C) regionalism

Explanation:

Regionalism is exemplified as the 'local color' that provides the emphasis on a specified region and its traditions, dialects, characters, etc. The chief aim is to highlight the features of a particular region and propose a recognition to them.

As per the question, the use of dialect (assumed to be the use of dialect in "Huckleberry Finn") by Twain exemplify 'regionalism'. Twain was a realist who gave emphasis on the real-life subjects and portrayed them as 'true to life' that proposed an authentic touch to his writing. He employed 'local color' as reflected by the use of 'inappropriate phrases and grammar' that gives it a slang-like quality and assist the audience to connect to it. Thus, option C is the correct answer.

Answer: a modernism