Concept:Mother tongue-based multilingualism means starting education in the child’s home language and gradually adding other languages.Explanation:This approach uses the mother tongue as the foundation for learning. It helps children build strong cognitive and reasoning skills. They can then smoothly learn additional languages, including English. This method respects the child’s home language and makes school language transition easier. Multilingual children often show better thinking skills and academic performance. The goal is to add many languages, not just English. Option A correctly describes this process.Answer:A. Starting one's schooling in the mother tongue and move on to add many languages.