Retirement tax questions

Just to clarify.  My wife died in July of 2018.  I filed a final joint tax return in 2019.  Just as I had done ever since we were married.   Now tax year 2019 I got the 1099-C as few days ago in 2020.  I have no minor children so I don't qualify to file as a widower.  I'm filing single for tax year 2019.