The language which is learnt from environment without any explicit teaching is

The correct option is First language.

Step-by-Step Explanation:

1. First Language (Mother Tongue / Native Language): A child acquires their first language naturally from their surrounding environment (family, community, caregivers) through exposure, interaction, and continuous immersion. This process is called language acquisition and occurs naturally without any formal instruction or explicit teaching.

2. Second / Third / School Language: These languages are typically learned in a structured educational environment (such as a school) through deliberate practice, grammar rules, and formal instruction. This process is called language learning.

Hence, the language acquired naturally from the environment without explicit teaching is the First language.