A、The child’s fingers. B、The child’s brain. C、The child’s language ability. D、The child’s face. D从短文中可以知道不要看一个孩子的手指，而足他的脸，以此来决定母

Are you discussing whether to give your child music lessons? Don’t look at his fingers. Look at his face and determine whether he is left-faced or fight-faced. Most talented musicians are left-faced. They include singers, conductors, conductors, and even country music artists. Beethoven, Tchaikovsky, Liszt and many others were left-faced.
   Just as most of us are either left-handed or right-handed, everybody has a more dominant and flexible side on his face. This is determined before birth. It has a link to the dominant side of the brain. Left-handed people are more able in the right side of the brain. One of the specializations of the right half of the brain is the understanding of music. The left half, on the other hand, specializes in language and numbers, among other things.
According to the passage, what helps a mother decide whether to give her child music lessons?