Senior Statement pls help!

I was accepted to FSU and ended up getting a D senior year. They recently notified me that because I got a D my acceptance is being reconsidered. I had a 4.4 gpa and a 29 on my ACT, this is the only D I’ve ever received and don’t know what to put in my senior statement or what to say. Any help would be appreciated or any ideas on my chances of keeping admisson. Im also currently in at FSU for the summer term right now.