If the rules are normal, it must be a divorce, but if you are worried that others will gossip about you behind your back, or, well, you feel a little embarrassed, or other circumstances, you can write married or unmarried. If you write married or unmarried, and finally let your colleagues know that you are divorced, they will also talk about you behind your back. Personally, I think it's better to be honest and generous, because divorce is not a shameful thing in society now. Just write divorce normally. After you weigh the pros and cons, choose the one you think is more suitable.