根据语篇内容，选择最佳选项。

Food is colorful. Some food is green, some food is red, and some is black. Now more and more people like to have black food--black rice, black beans, black grapes. Why do they like black food? Some people say,

*Black food can make grey. (灰色的)hair into black hair.

*Black food is good for the heart(心脏)

*Black food can help children(孩子)become clever.

Black food is very good, but we need food with different colors. Doctors say that it isn't good to be choosy about food. So we need to eat al1 kinds(种类)of food.