Concept:Bilingualism means using two languages together. In a classroom, it is now seen as a positive and helpful tool.
Explanation:Earlier, bilingualism was wrongly thought to be a hindrance or problem for language learning.
Modern research shows it is not an obstacle. Instead, bilingualism helps learning by using the mother tongue alongside the new language.
It makes students more flexible in communication and open to different cultures.
Thus, bilingualism enriches learning and is an important resource, not a burden.
Answer:C. an important resource of language learning