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Comprehensive and Detailed Explanation:

The NCST Report Writing section includes a focus on commonly confused words (homophones). "Affect" and "Effect" are two of the most frequently misused words in professional writing. "Affect" is usually a verb (an action), while "Effect" is usually a noun (a result). In this sentence, the word is following the adjective "negative," indicating that it is a noun referring to the result of the behavior. Option B is grammatically incorrect (wrong tense/form). Option C uses "affect" as a noun, which is only correct in a psychological context (referring to a person's facial expression), not as a synonym for "result." Option D uses "effected" as a verb, which means "to bring about" (e.g., "he effected a change"), which is not the intended meaning here. Option A is the correct answer. It uses "effect" as a noun to correctly describe the result or impact the inmate's behavior had on the unit.