Take context from the input text and decide on the accurate relationship between 'Stora Enso' and 'paper' from the options provided.
Options: owned by, product/material produced, platform, distribution format

Finnish paper producer Stora Enso (Xetra: ENUR.DE - news ) fell 8.8 percent after it reported weaker-than-expected quarterly profit due to production problems and higher costs.
product/material produced