阅读短文，从每小题所给的四个选项中，选出能回答所提问题的最佳答案。

    There are fifty students in our class. There are twenty-four boys and twenty-six girls. Some students live near the school, and some others live far from school. About half of the students usually come to school by bike. They often get to school at a quarter to seven. About fifteen students often come to school by bus. They often get to school very early, too. Another ten students come to school on foot. Their homes are near the school, but they are often late for school, because they get up late.

在社会主义初级阶段，实现“中国梦”是我们最大的理想，是我们共同的思想基础。而改革开放则是实现“中国梦”的关键一招。

如图，圆柱的高为10cm，底面半径为2cm，在圆柱下底面的A点有一只蚂蚁，它想吃到上底面上与A点相对的B点处的食物，它需要爬行的最短路程是多少厘米？