Which of the following plays the basic role in learning a mother tongue?

Correct option is B

Naturalness is the basic factor in learning a mother tongue. A child learns their mother tongue effortlessly and unconsciously in a natural environment, primarily through exposure, imitation, and interaction with family and society. This natural acquisition occurs without formal instruction and is based on the instinctive ability to grasp the language's structure and usage.
Information Booster:
1. Environment: A supportive, language-rich environment fosters natural acquisition.
2. Process: Includes listening, speaking, and later reading and writing skills.
3. No formal teaching: Learning occurs without structured lessons, unlike second-language acquisition.
4. Critical period: Language learning is most effective in early childhood.
5. Imitation and interaction: Listening to others and engaging in conversation are key elements.
Additional Knowledge:
(A) Motivation: Although motivation enhances language learning, it is not the primary driver in mother tongue acquisition, which occurs naturally. (C) Habit formation: Habit formation plays a secondary role as language learning involves practice, but it is not the most basic factor. (D) Purpose: While purpose influences second-language learning, mother tongue acquisition is not driven by purpose but by exposure and interaction.