At primary level, it is better to teach in mother language because

Correct option is D

it helps children to learn in a natural atmosphere.
Teaching in the mother language at the primary level is beneficial as it's the language children are most comfortable and familiar with. This comfort provides a natural and effective environment for learning. Children can express themselves clearly and understand concepts better when taught in their native language. This approach also supports cognitive development and builds a strong foundation for learning additional languages in the future.