What should I put in a job application when it asks why I was fired from a job?

A year ago I was arrested for reckless driving. My license was suspended for 90 days. I paid a $500 fine. Had to do 40 hrs community service. I have my license back, but my last job fired me because of this. I'm filling out an application for an entry level job, and its asking if I have ever been involuntary terminated from a job, and to explain why, and I dont know how to explain it.

What should I put in a job application when it asks why I was fired from a job?
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