**Core Concept**
Displacement is a psychological defense mechanism where an individual redirects their emotions, usually negative feelings, from the original source to a more acceptable or less threatening target. This coping mechanism helps individuals avoid confronting uncomfortable emotions or situations.

**Why the Correct Answer is Right**
The correct answer for displacement involves redirecting emotions, which is a common defense mechanism used by individuals to cope with stress, anxiety, or other negative emotions. Displacement is often seen in situations where an individual may feel overwhelmed or angry about a particular issue, but instead of addressing the root cause, they redirect their emotions towards a more manageable or less threatening target. This can be seen in behaviors such as yelling at a child when frustrated with a spouse or hitting a pillow when angry about a work-related issue.

**Why Each Wrong Option is Incorrect**
**Option A:** Denial is a defense mechanism where an individual refuses to acknowledge or accept an uncomfortable reality. While denial is a common defense mechanism, it does not involve redirecting emotions to a different target, making it an incorrect choice.

**Option B:** Projection is a defense mechanism where an individual attributes their unacceptable thoughts or feelings to someone else. Projection involves attributing emotions or behaviors to another person, whereas displacement involves redirecting emotions to a different target, making it an incorrect choice.

**Option C:** Rationalization is a defense mechanism where an individual creates a logical explanation for their unacceptable behavior. Rationalization involves justifying or making excuses for one's behavior, whereas displacement involves redirecting emotions to a different target, making it an incorrect choice.

**Option D:** Regression is a defense mechanism where an individual reverts to an earlier stage of development. Regression involves a return to a previous stage of development, whereas displacement involves redirecting emotions to a different target, making it an incorrect choice.

**Clinical Pearl / High-Yield Fact**
Displacement can be a subtle defense mechanism, making it essential to recognize and understand its manifestations in various situations. By recognizing displacement, individuals can develop healthier coping mechanisms and address the root cause of their emotions.

**Correct Answer:** C.