## Core Concept
The question tests knowledge of evidence-based treatments for depression, specifically focusing on psychological therapies. Depression is a complex mental health disorder that can be treated with various interventions, including pharmacotherapy and psychotherapy. Among psychotherapies, several modalities have been studied for their efficacy in treating depression.

## Why the Correct Answer is Right
Cognitive Behavioral Therapy (CBT) is widely recognized as an effective treatment for depression. **CBT** focuses on identifying and challenging negative thought patterns and behaviors that contribute to a person's depression. It is based on the cognitive model of depression, which posits that depression results from biased or unhelpful thinking patterns and learned patterns of unhelpful behavior. The goal of CBT is to help individuals understand and change their thought patterns and behaviors, thereby improving their mood and functioning. Numerous studies and meta-analyses have demonstrated the efficacy of CBT in treating depression.

## Why Each Wrong Option is Incorrect
- **Option A:** While other forms of psychotherapy, such as psychodynamic therapy, can be helpful for some individuals with depression, they are not considered the first-line psychological treatment based on current evidence.
- **Option B:** This option is blank and does not provide a viable alternative.
- **Option D:** This option is also blank and does not offer a valid choice.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **Cognitive Behavioral Therapy (CBT)** and **Interpersonal Therapy (IPT)** are often cited as the two psychological therapies with the strongest evidence base for treating depression. Among these, CBT is frequently recommended due to its relatively short duration and structured approach, making it a preferred option for many patients.

## Correct Answer Line
**Correct Answer: C. Cognitive Behavioral Therapy.**