The following passage is from page 43 of the book Famous Authors (Men) by E. F. Harkins Mark Twain's real name is Samuel Langhorne Clemens. However, he is most popularly known, by his pen-name of Mark Twain.
The humorist's autobiography is already an open book. It has been recorded piece by piece in a hundred magazines and in a thousand newspapers since 1868. Probably no other living author has been so sought after by editors and reporters. Assuredly no other living author has been friendlier or more liberal in his responses.
As a man and as a writer Mr. Clemens was a typical American. A stern sense of duty and of honor, a seldom absent sense of humor, endless energy, bold determination, sincere simplicity and lasting sympathy and loyalty, are the true characteristics of the typical American of Mr. Clemens. At the same time, in addition to the writer's unmatched powers of observation and richness of imagination, is his fine sense of artistry. "Mark Twain's humor will live forever," Mr. Howells is reported to have said some years ago, "because of its artistic qualities. Mark Twain depicts real types, not only with keen sense of appreciation and sympathy but also with a force and truth of leaving a lasting impression." Professor Barrett Wendell, a picky critic, has elaborated on the constant and incredible charm of Huckleberry Finn.
Mr. Clemens was born in a little Missouri village named Florida on November 30, 1835. His father John Marshall Clemens was one of the pioneers who crossed the Alleghany Mountains to seek a better life in the West. His mother was Elizabeth Lampton. She has been described as "one of those graceful and lively Kentucky girls who have contributed to the reputation of the State."
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According to MLA guidelines, which example is the best paraphrase of the following sentence from the passage?

A stern sense of duty and of honor, a seldom absent sense of humor, endless energy, bold determination, sincere simplicity, and lasting sympathy and loyalty, are the important characteristics of the typical American—of Mr. Clemens.
A.
The key traits of a true American like Mr. Clemens are his faithfulness, wit, enthusiasm, sincerity, compassion, and dedication (Harkins 45).
B.
A typical American should be dutiful, humorous, energetic, simple, and dedicated (Harkins 45).
C.
Mr. Clemens was a typical American for his sense of duty and of honor, sense of humor, energy, determination, simplicity, and sympathy and loyalty (Harkins 45).
D.
Mr. Clemens, a typical American, represented duty and honor, sense of humor, endless energy, bold determination, sincere simplicity, and lasting sympathy and loyalty (Harkins 45).