Miss Jones teaches at a school. In one of her classes, the boys and girls are about eight years old, and they are not good at maths. Miss Jones always wants to make her lesson interesting and useful. One day she gave them a question. "If you go to the shop to buy apples," she said, "and an apple and a half cost twelve pence（便士）, how much will you have to give for twelve apples?" The pupils began to write in their exercise books, and for a time nobody spoke. Then one boy put his hands up and said, "Could you say the question once again, please?" Miss Jones said, "If an apple and a half…" but the boy shouted. "Oh, an apple and a half?" he said."All the time I am working it out in oranges, Miss Jones. So the answer must be different."

Miss Jones teaches ______.

A.very little babies

B.high school students

C.very good students

D.maths in one class