The two most important writers of the last half of the nineteenth century were

The two most important writers of the last half of the nineteenth century were Henry James & Samuel Langhorn Clemens

Explanation:

Henry James was considered by many a key transitional figure between literary realism. He is known for the big quantity of social material he made.  The Portrait of a Lady, The Ambassadors, and The Wings of the Dove. are some examples of that.

Samuel Langhorn Clemens was better known by his pen name Mark Twain. He was a humorist, entrepreneur, publisher, and lecturer. Two of his most famous novels were The Adventures of Tom Sawyer and the Adventures of Huckleberry Finn.

the answer is c. the wind

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