**Core Concept**
Mature defense mechanisms are psychological coping strategies that help individuals manage stress and anxiety in a healthy, adaptive way. These mechanisms enable individuals to maintain a sense of control, self-esteem, and emotional well-being in the face of adversity.

**Why the Correct Answer is Right**
Sublimation is a mature defense mechanism that involves redirecting unacceptable impulses or desires into more socially acceptable behaviors. For instance, a person with aggressive tendencies may channel their energy into a creative pursuit like painting or writing. This defense mechanism allows individuals to transform their negative emotions into positive outlets, promoting emotional growth and well-being.

**Why Each Wrong Option is Incorrect**
**Option A:** Repression is an immature defense mechanism that involves pushing uncomfortable thoughts or memories into the unconscious mind. Unlike sublimation, repression does not allow for healthy emotional expression or growth.

**Option B:** Denial is also an immature defense mechanism that involves refusing to acknowledge or accept reality. In contrast, sublimation acknowledges and accepts reality while redirecting negative emotions into positive outlets.

**Option C:** Projection is a defense mechanism where an individual attributes their own unacceptable thoughts or feelings to someone else. Projection is not a mature defense mechanism, as it distorts reality and hinders emotional growth.

**Clinical Pearl / High-Yield Fact**
Mature defense mechanisms like sublimation can be an essential part of maintaining good mental health and developing resilience in the face of stress. Practicing mindfulness, self-reflection, and creative expression can help individuals develop these adaptive coping strategies.

**Correct Answer:** C. Sublimation is a mature defence mechanism.