A teacher uses child's native language as medium of instruction for teaching the target language. She is using:

Correct option is A

Grammar translation method.
The grammar translation method is a traditional language teaching approach that emphasizes the understanding of grammatical rules and the translation of words and phrases from the native language to the target language. In this method, the teacher primarily uses the native language as the medium of instruction, explaining grammatical concepts and vocabulary in the native language and then translating them into the target language. Students are expected to memorize grammar rules and vocabulary translations, with a focus on accuracy and precision in translation exercises.