阅读下面短文，从短文后各题所给的四个选项A、B、C、D中，选出可以填入空白处的最佳选项。
An old man pointed at the land filled with weeds (杂草) and asked his students, "Look, what's growing on the land?"
"1 ," the students answered without thinking twice.
"Tell me, how should you 2 these?"
His students were 3 : this question was too simple.
A student first said, "4 I have a hoe (锄头), the weeds will be killed off. "
The second student followed, "It would be 5 to burn them with fire. " The third student argued, "Only 6 deep can it never be born again. "
After his students finished, the old man stood up and said, "Well, when you go back, you act on your own way and come back here again in one year. "
A year later, his students came, but they were so 7 . Because whatever they did, the weeds were still there, even more somewhere. The students wanted to go to the old man for 8 very much.
9 , the old man had died, only leaving one book to his students. One paragraph in the book wrote, "10 way is impossible to kill all the weeds because they are too strong. The best way is to plant crops (庄稼) on the land. Have you ever thought the mind of people is also 11 the land?"
This world is colorful and then our hearts would 12 many wishes for different things in the world. Some of the wishes are "weeds". Without water and food, they will also grow 13 . So if we don't keep our eyes open, we will make our 14 poor. These "weeds" are called "Evil (邪恶)". Some of the wishes are "crops". They need planting and taking care of.
The more "crops" there are, the less space the "weeds" 15 ; the stronger the "crops" are, the weaker the "weeds" will be. These "crops" are called "Virtue (美德)"
