Concept:Bilingualism means using two languages, like the mother tongue and the target language, in the classroom.
Explanation:Earlier, bilingualism was wrongly seen as a hindrance to language learning.
Today, research shows it is not a burden or obstacle.
Bilingualism actually enriches learning and makes students more versatile and open-minded.
It provides a valuable resource for understanding and using the new language.
Bilingualism facilitates, not hinders, the learning process.
Answer:C. an important resource of language learning