单项选择题
Some people are right-handed and some are left-handed.No one knows the reason why a person becomes right-handed or left-handed.It is not true that it is caused by the way in which his parents educate him.In other words，a person is born to be right-handed or left-handed.Moreover，the left-handed and the right-handed ’think’differently.Having to use the hand you’re not used to can be very upsetting.
One day I tried an experiment：changing hands while eating rice with chopsticks.Being a right-hander，I hoped it would not be too hard for me to take the food with my left hand.Soon after I started，I realized I didn’t know what I was doing.So I moved in front of a big mirror in order that I could observe my actions clearly.Looking at myself in the mirror，I found I looked like a man who had never used chopsticks.I became more and more nervous and finally I had to give it up.
My experience shows，being forced to use the hand one Is not used to affects a person’s mind.So we should not try to change a left-hander.Some people still think being left-handed，is bad，but lucidly this idea is changing.
A．the education of the parents
B．the education of the teachers
C．the practice of oneself
D．the example of the friends