Context: In fact , so much so , that the lines contained large chunks of yeast and protein . And it was n't just my unfiltered - Belgian - beer line . The lines for Stella Artois and Miller Lite , if not chunky , were also filthy . I told the owner that he needed to clean his draft beer lines , and pronto .

Question: Why did the lines contain large chunks of yeast and protein ?
Options:
0. None of the above choices .
1. Because it was n't just my unfiltered - Belgian - beer line .
2. Because the lines were dirty .
3. Because the lines for Stella Artois and Miller Lite , if not chunky , were also filthy .
Answer: 2