Final answer:
In Nepal, the most commonly spoken language is Nepali, and the largest ethnic group is the Chhetri, which is part of the broader Nepali ethnicity.
Step-by-step explanation:
The language spoken by the majority of people in Nepal is Nepali, which is an Indo-Aryan language derived from Sanskrit and is the official language of the country. Nepal is a diverse nation with many ethnic groups, but the largest ethnic group is the Chhetri, which is part of the broader Nepali ethnicity. Other significant ethnic groups include the Brahman-Hill, Magar, Tharu, Tamang, Newar, and others. Each group may speak its own language or dialect in addition to Nepali, reflecting the rich linguistic heritage of the country.