Last summer, Jeff became a middle school student. He was a good student, and he always worked hard. He had a test in the first month and he finished the questions easily until he read the last one:” What’s her name?”
Of course, this question was a little special.   She was tall and her hair was dark. But Jeff didn’t talk with her and didn’t know her name. The test was over.    Then a student asked the teacher, “Is the last question very important in this test?”
“Yes,” said the teacher. “In our life, we will meet many hard-working people. They are important.   We may smile at them or say hello to them. 
  He also learned that woman’s name later. It was Kathy.
根据材料内容，从下面五个选项中选出能填入文中空缺处的最佳选项，使短文意思通顺，内容完整，并将其标号填写在下面题号后的横线上。