Do you have to carry a heavy bag to school? Does it make your back   hurt? Well, students at a high school in Kansas  , America, have a meeting with their city's mayor  to complain   about their heavy bags. They say their bags are giving them headaches , and making their necks   and backs hurt. The mayor says he is very sorry. He says students may do more of their homework on the Internet. A heavy bag may make students  _  .
headache earache toothache A, B and C