1. The reason for the multiple-choice question should be your own interest orientation first. You can answer that you are interested in this research direction.

2. Secondly, the topic can be that I have done research in this field before, especially participated in related research.

3. Most students will participate in social practice, and many problems are discovered at this time, so the topics can also be selected from the problems in practice.

4. You can answer the teacher. According to your literature research, there is still a lot of research space in this area, which is worthy of your in-depth study and analysis.

You can also answer with your thesis advisor, who knows a certain aspect well and can get more guidance on topic selection.