## Core Concept
The patient's symptoms, including depressed mood, loss of appetite, insomnia, and lack of interest in surroundings, are characteristic of **Major Depressive Disorder (MDD)**. This condition often follows a significant life event, such as a business loss, and can be triggered by stress. The management of MDD typically involves a combination of psychotherapy and pharmacotherapy.

## Why the Correct Answer is Right
The correct approach in managing this patient would involve considering both pharmacological and psychological interventions. **Selective Serotonin Reuptake Inhibitors (SSRIs)** are commonly used as a first-line treatment for MDD due to their efficacy and relatively favorable side effect profile. **Cognitive Behavioral Therapy (CBT)** and **Interpersonal Therapy (IPT)** are also effective psychological interventions. The statement that likely corresponds to the correct answer emphasizes a comprehensive treatment plan, which may include medication and therapy.

## Why Each Wrong Option is Incorrect
- **Option A:** Without the specific details of option A, it's difficult to assess its accuracy directly. However, if option A suggests that only pharmacotherapy or only psychotherapy is sufficient, it would be incorrect because MDD often benefits from a multimodal treatment approach.
- **Option B:** Similarly, without specifics, if option B implies a treatment strategy that is not evidence-based or is incomplete (e.g., focusing solely on immediate symptom relief without considering long-term management), it would be incorrect.
- **Option D:** If option D proposes a treatment plan that is not supported by current clinical guidelines for MDD (e.g., recommending only lifestyle modifications without considering medication or therapy), it would be incorrect.

## Clinical Pearl / High-Yield Fact
A key point to remember in the management of depression is the importance of **monitoring for suicidal ideation** and ensuring that the patient has a **support system** in place. Additionally, it's crucial to **rule out other conditions** that can mimic or cause depression, such as thyroid disorders or substance abuse.

## Correct Answer Line
**Correct Answer: C.**