**Core Concept**
Rotter's nodes are **interpectoral lymph nodes** located in the **anatomical region** between the pectoralis major and pectoralis minor muscles. They play a crucial role in the **lymphatic drainage** of the breast.

**Why the Correct Answer is Right**
The correct answer is related to the location of Rotter's nodes, which is between the **pectoralis major** and **pectoralis minor muscles**. This location is significant for **breast cancer staging** and **surgical interventions**. The interpectoral lymph nodes, or Rotter's nodes, are involved in the lymphatic drainage of the breast and can be a site for **metastasis**.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the location of Rotter's nodes.
**Option B:** This option is also incorrect as it does not specify the correct anatomical location.
**Option D:** Similarly, this option is incorrect as it does not relate to the known location of Rotter's nodes.

**Clinical Pearl / High-Yield Fact**
Rotter's nodes are significant in **breast cancer** as their involvement can affect **treatment planning** and **prognosis**.

**Correct Answer:** C. pectoralis major and pectoralis minor muscles.