On the suburb of a town in England, there lived an old man in a nice house with a large garden.        He watered and fertilized（施肥）them.
One day a young man went by the garden. He looked at the beautiful flowers, imaging how happy he could be if he lived in such a beautiful place.          He was very surprised about this and asked, “You can’t see these flowers, why are you busy taking good care of them every day?”
The old man smiled and said, “I can tell you four reasons. First, I was a gardener since I was young, and I really like this job. Second, although I can’t see these flowers, I can touch them. Third, I can smell the sweetness of them.        ”
“Me? But you don’t know me,” said the young man.
“Yeah, it’s true that I don’t know you. But I know that flowers are angels（天使）that everyone knows.   ”
The blind man’s work opened our eyes and pleased our hearts, which also made his life happier. It was just like Beethoven.        Beethoven himself couldn't hear his wonderful music, but his music has encouraged millions of people to face their difficulties bravely. Isn't it one kind of happiness?
根据短文内容，从下面五个选项中选出能填入文中空缺处的最佳选项，使短文意思通顺，内容完整。