Which language is the most widely spoken Slavic language?

Which of the following languages uses the Cyrillic alphabet?

Which of these Slavic languages is primarily spoken in Poland?

Which of these languages belong to the West Slavic group?

Which of these Slavic languages are spoken in the Balkans?

This language is spoken in the country of Croatia and uses the Latin alphabet.

Which language is spoken in Serbia?

Which language is spoken in Slovakia?

This Slavic language is spoken in Bulgaria and uses the Cyrillic script.

Which Slavic language uses both the Cyrillic and Latin scripts?