单项选择题

The more engaged a parent is, the more the child benefits, adds Bruce Arai. "The evidence is clear: Parental involvement is one of the most important factors in school success. "Arai cites the National Longitudinal Survey of Children and Youth, sponsored by Human Respirces Development Canada (HRDC), which is measuring all aspects of child development. "The hours children spend in class are not one element of their education," states HRDC, which says parental support, along with teacher support and a positive attitude towards school, all contribute to academic success.
A child’s academic performance by all the following factors EXCEPT