The main idea of the professor’s essays

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The main idea of the professor's essays are a defense of the concept of free-market economics.

(A) The main idea of the professor's essays are a defense of the concept of free-market economics.
(B) The main idea of the professor's essays is defending free-market economic concepts.
(C) The professor's essays have defending the concept of free-market economics as their main idea.
(D) The professor's essays have a main idea of the defense of the concept of free-market economics.
(E) The main idea of the professor's essays is a defense of the concept of free-market economics.

OA: E

Source: Original question
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