Which of the following is TRUE according to the passage……

B Scientists have found a new use for children’s imaginations - to make stomachaches go away. The BBC reports a new study that shows：“Children can be taught to use their imaginations to deal with stomachaches.” This may be very good news for parents who need a quick cure for their sick children. Any mother or father understands：the stomach problem is one of the most frequent things their children complain about. Around twenty percent of children suffer from stomachaches that doctors cannot find a reason for. This new research is especially good for kids with active imaginations.Researchers found that the more creative the child is, the better he or she is at imagining the pain away. The researchers used a relaxing CD with children. A voice guided them them through different fantasy situations. One of these was pretending to be floating on a cloud. Thirty children took part in the tests. Half of them used the “guided imagery”method, and the other half received normal medicines. Researchers found 73.3 percent of kids who got normal treatment. Study leader Dr. Miranda Tilburg was very exited about her findings.She believed that it was a very cheap and easy to stop children’s stomachaches. She said it would not work as well with adults.Which of the following is TRUE according to the passage （ ）

A．Sometimes, doctors don’t know why children suffer from stomachaches.
B．Children complain about their learning problems most frequently.
C．The more creative the children is,the less likely he or she is to have a stomachache.
D．30children received normal medicines in the tests.