Urgent: why did the polish empire dissapear and when did they come back as a country?

I found this on yahoo if it helps.
During the period from 1796 to 1919, Poland did not exist as a separate country. Poland was divided between and ruled by three countries (empires) - Austria, Prussia, and Russia
Between the two world wars (1919-1939), Poland re-emerged as a large independent nation, whose territory extended all the way from the Poznan area in the west to the Wilno (Vilnius) area in the east. In the interwar period, Poland included significant parts of what are today Lithuania, Belarus, and western Ukraine.  
sgisn yahoo, I hsve not learned about Poland yet I'm in 9th grade

The correct answer is b