text: In my opinion, i think you should let the students at least have a C average because it can be like a warning to them saying that not only will they be not eligible for sports but that they are also at risk of failing. Some students can't be expected to have straight A' s and B' s because some students may not be good at a specific subject. They could just be having trouble and they really want a another chance. That's why instead of not letting them join other activities you should just provide tutoring for these kids.