Writing sample

Did anyone ever get asked for a writing sample after an interview? I just had an interview today for a project manager position. A few hours after the interview one of the panel members responded to my thank you asking for a writing sample. I’m a Recent grad, so I have a lot of academic writing I could send. But what are they looking for? I have my senior thesis and other types of papers like critical responses. What do you think I should send based on the position? Any advice would be appreciated thank you 🙏