Correct option is D
The correct answer is (d)   Indo-European (Aryan). 
 • The Indo-European (Indo-Aryan) language family covers nearly   75–80% of India’s population, making it the most widely spoken linguistic group.  
 Information Booster: 
 • Major Indo-Aryan languages: Hindi, Bengali, Marathi, Gujarati, Punjabi, Assamese.  
 • Dravidian languages (e.g., Tamil, Telugu, Kannada, Malayalam) form the second largest group (~20%).  
 • The Sino-Tibetan family is mainly spoken in the   Himalayan and Northeastern regions.  
 • Austric (Munda) languages are spoken by   tribal groups in central and eastern India.  
 • The linguistic classification was first systematized by   Sir George Grierson’s Linguistic Survey of India (1894–1928).  
 
