Step 1: Understanding sources of diversity in India.
Diversity in India is reflected through various factors such as culture, religion, and language, which vary significantly across regions, communities, and traditions.
Step 2: Identify the outlier.
The National Emblem, while a symbol of India's unity, does not contribute to the diversity in India. It represents the nation as a whole and does not reflect the diverse cultural, religious, and linguistic practices present across the country.
Step 3: Conclusion.
The National Emblem is not a source of diversity in India.
Final Answer: \[ \boxed{\text{The correct answer is (D) National Emblem.}} \]