I was watching Sports center last night when one of those "human interest" stories came on and really caught my attention.  The story was about a 27-year-old professional Bass Fisherman named Clay Dyer. At first, they played it off as another guy trying to make the cut on the Bass master tour until they showed a picture of him. No legs, no arm, or rather, he has only 1/3 of his right arm. That's all that he has.  It was such an amazing story that I was wondering what this guy could do. Growing up, he learned to play baseball and basketball, but found that fishing was his true calling. And he does it all on his own. He holds the fishing pole under his chin and uses that and his stub   arm to cast and reel in  the fish. He uses his teeth to help him unhook fish. He ties his own hooks or lures on with his mouth, never really asking anyone else to help. Clay Dyer even knows how to swim. Since his body can't produce enough sweat on its own, he has to take a dip in the lake every few hours to keep cool. He dives in just like anyone else, then somehow treads water  with his stub arm, then, with a little help, pulls himself back up into the boat and goes on fishing.  Clay Dyer has never looked for others' pity, nor has he allowed his physical disabilities to prevent him from becoming a professional fisherman. His motto for life is "If I can, you can." He refuses to use special equipment, saying, "I want to do it with one hand the way they do it with two." While fishing, Dyer dives into the lake from time to time   _  .
to change the lures to do some exercise to cast a fishing line to cool himself down
Question: I was watching Sports center last night when one of those "human interest" stories came on and really caught my attention.  The story was about a 27-year-old professional Bass Fisherman named Clay Dyer. At first, they played it off as another guy trying to make the cut on the Bass master tour until they showed a picture of him. No legs, no arm, or rather, he has only 1/3 of his right arm. That's all that he has.  It was such an amazing story that I was wondering what this guy could do. Growing up, he learned to play baseball and basketball, but found that fishing was his true calling. And he does it all on his own. He holds the fishing pole under his chin and uses that and his stub   arm to cast and reel in  the fish. He uses his teeth to help him unhook fish. He ties his own hooks or lures on with his mouth, never really asking anyone else to help. Clay Dyer even knows how to swim. Since his body can't produce enough sweat on its own, he has to take a dip in the lake every few hours to keep cool. He dives in just like anyone else, then somehow treads water  with his stub arm, then, with a little help, pulls himself back up into the boat and goes on fishing.  Clay Dyer has never looked for others' pity, nor has he allowed his physical disabilities to prevent him from becoming a professional fisherman. His motto for life is "If I can, you can." He refuses to use special equipment, saying, "I want to do it with one hand the way they do it with two." While fishing, Dyer dives into the lake from time to time   _  .
A. to change the lures
B. to do some exercise
C. to cast a fishing line
D. to cool himself down
Answer: