Answer: Biography
Step-by-step explanation:
Qualitative research refers to the collection and the analysis of non-numerical data in order to have a detailed information about a particular topic.
The data can be gotten through first-hand observation, focus groups, questionnaires, interviews etc. In the scenario in the question, the type of qualitative research that the student should employ is the biography which is the account of the life of a person that is written by someone else. In this case, he will write the biography of his English teacher.