**Core Concept**
The question tests the understanding of salivary gland anatomy and pathology, including the types of tumors and surgical procedures. **Salivary glands** are divided into major and minor glands, with the parotid gland being the largest.

**Why the Correct Answer is Right**
The correct answer is related to the fact that **90% of minor salivary gland tumors are malignant**, which is a key point in distinguishing them from parotid tumors. **Superficial parotidectomy** is a surgical procedure often performed for parotid tumors, and **Warthin's tumor** is a common benign tumor of the parotid gland.

**Why Each Wrong Option is Incorrect**
**Option B:** is incorrect because the majority of parotid tumors are benign, not malignant.
**Option E:** is incorrect because Warthin's tumor is benign, not commonly malignant.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that the majority of salivary gland tumors occur in the parotid gland, and most parotid tumors are benign, whereas minor salivary gland tumors have a higher likelihood of being malignant.

**Correct Answer:** C. c) 90% of minor salivary tumors are malignant