Which of the listed peoples belongs to the Finno-Ugric group?

Resolution:

• The question asks to identify which of the given nationalities belongs to the Finno-Ugric linguistic group.
• Let's examine each option:
• a) Chechens: Belong to the Nakh branch of the Northeast Caucasian languages.
• b) Mordvins (Moksha and Erzya): Are a Finno-Ugric people.
• c) Buryats: Belong to the Mongolic languages.
• d) Avars: Belong to the Northeast Caucasian languages.
• Therefore, Mordvins are the Finno-Ugric people among the options.

Final Answer: b) Mordva