题目

Carol and Susan are very good friends. They are in the same class at school and they often go to each other’s home on Sunday. Now they are both eight yeas old. Carol’s mother has got a new baby. Carol is very glad to have a little sister, so she is always talking about her to Susan.       At first Susan is very interested (感兴趣) in the new baby because she does not have any brothers or sisters. But after some time she begins to get tired of (厌倦) Carol’s keeping on talking about it. She also feels a little jealous (嫉妒) of her friend.       One morning when the two若定义ρ≥0，则由极坐标方程θ=π3，θ=2π3和ρ=8所表示的曲线围成的区域的面积是（　　） A、32π3B、16π3C、8π3D、4π3