**Attribution Theory**
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**Core Concept**
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Attribution theory is a concept in psychology that refers to the process by which individuals explain or attribute the causes of events or behaviors to internal or external factors. This theory is relevant in the context of interpersonal relationships and social interactions, where individuals may try to shift the responsibility for their unacceptable feelings to others.

**Why the Correct Answer is Right**
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The correct answer is related to a defense mechanism known as "projection." Projection is a psychological defense mechanism where an individual attributes their unacceptable thoughts, feelings, or motivations to someone else. This defense mechanism is used to avoid taking responsibility for one's own feelings and behaviors. Projection can be seen in individuals who accuse others of having the same unacceptable thoughts or feelings that they themselves possess.

**Why Each Wrong Option is Incorrect**
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**Option A:** Free association is a defense mechanism where an individual makes an unconscious connection between two seemingly unrelated ideas or words. Free association is not related to attributing one's unacceptable feelings to others.

**Option B:** Rationalization is a defense mechanism where an individual creates a logical explanation for their unacceptable behavior or feelings. While rationalization is a defense mechanism, it is not specifically related to attributing one's feelings to others.

**Option C:** Denial is a defense mechanism where an individual refuses to acknowledge or accept an uncomfortable reality. Denial is not related to attributing one's unacceptable feelings to others.

**Clinical Pearl / High-Yield Fact**
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Projection is a common defense mechanism used in individuals with narcissistic personality disorder, where they may attribute their unacceptable feelings to others in order to maintain a sense of grandiosity and self-importance.

**Correct Answer:** C. Projection.