Btw, kindergarten teacher - fave occupation of our writer - can be mail too. Ovobacsi mogott en is szivesen kilepnek az utcara. Ha ha

"a" or "az" is possible before words beginning with "ó"?

Wow this is a discouraging module... :S

There appears to be a mismatch between the offered option and the correct option: Offered in multiple choice: A gyerekek kilépnek az utcákra a óvónő mögött. Corresponding correct choice: A gyerekek kilépnek az utcára a óvónő mögött

This is one of the multiple choice questions with multiple correct answers, except that one of the options is for plural (utcákra) while Duolingo seems to think it is singular (utcára).