Thad is a 14-year-old who was diagnosed with cystic fibrosis at the age of two. Thad's parents have helped him to stay healthy during his childhood by encouraging him to eat a variety of foods, take his medications regularly, and wash his hands often to prevent infection. Since becoming a teenager, Thad has become less consistent with taking his pancreatic enzyme replacement on a regular basis. He has told his parents that he is angry about his diagnosis and he doesn't know why he needs to follow so many rules. He wants to live his life just like any other teen his age. Which water-soluble vitamin is found in the greatest amounts in the pancreas?