``` The correct word to complete the sentence is (c) "exclusive." The complete sentence would be: "Nutritionists have long emphasized the importance of a balanced diet, which is essential for maintaining a reliable excretory function. Only with a(n) exclusive intake of nutrients can an significantly improve overall health and vitality." ```
Unfortunately, the provided image does not clearly display the content required to complete the question. The sentence is incomplete, and the multiple-choice options (A, B, C, and D) are visible but do not provide enough context to ascertain which choice correctly completes the sentence. Therefore, I cannot provide a solution.
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