阅读下面材料，从每题所给的四个选项（ABCD）中选出最佳选项。
C
I live in a beautiful city of Yunnan province. Many visitors come to my city every year.
There are so many colorful peacocks(孔雀) here. Most peacocks live on the grass land of Spring Square. Some visitors give food to the birds freely. They usually throw food to them, and don't think about at all whether(是否) the food is right or not. Some of the peacocks became ill, some even died after eating the bad food from the visitors.
I'm sure most of the visitors who throw food to the peacocks really like the birds, but don't know that they may be doing something bad to them.
I think we should show a notice to tell the visitors that this kind of thing must be stopped. Also, we can build some small shops beside the square to sell peacock food. It's really important to give more love to these beautiful birds and to look after them carefully.
