Knowledge of more than one language

Correct option is C

is very helpful in teaching and learning a new language.
Knowing multiple languages benefits both teachers and students in a language classroom. It enriches the teaching process by providing a broader understanding of linguistic structures and cultural contexts. Multilingual teachers can draw parallels between languages, clarify doubts, and correct errors effectively. Students with multilingual skills have a cognitive advantage; they can transfer skills from one language to another, making it easier to learn new languages. They also tend to have better problem-solving skills, memory, and flexibility in thinking, enhancing their learning experience.