单选题

　　[阅读理解]The researchers also gave the students tests to tell whether the students believed that a math superstar had to be a boy. Then the researchers turned to the teachers To find out which teachers were anxious about math， the researchers asked the teachers how they felt at times when they came across math， such as when reading a sales receipt. A teacher who got nervous looking at the numbers on a sales receipt， for example， was probably anxious about math.

　　According to the experiment， those teachers were probably anxious about math when they felt______.

　　A、nervous memorizing the numbers of a sales receipt

　　B、helpless saving the numbers of a sales receipt

　　C、uneasy reading the numbers of a sales receipt

　　D、hopeless filling in the numbers of a sales report