Reading Comprehension 
从下列每篇短文的问题后所给的四个选择项中选出一个最佳答案。
     By the time she got the box open, Nancy was so excited that she could hardly contain herself. Eagerly she removed the cotton surrounding the small object inside the box, and held it up to the light. It glittered and sparkled （闪闪发光）—made alive by the bright sunlight pouring through the window.
     Nancy turned the object slowly in her hands, first this way and then that way. It continued to sparkle and shine as if it had a light of its own. She cried out in delight. Her diamond engagement ring had been found and returned to her, just as the woman on the phone had promised.
     For two weeks, Nancy almost collapsed after losing the ring on the subway. She had placed ads in the newspapers and on the radio, offering a reward for the return of the ring. And, she had almost given up hope when the phone call came.
     A kind, elderly female voice informed her that she had found the ring between seat cushions（坐垫）. She had called, she said, to make sure of the exact address and had promised to return the ring by insured mail the next day.　And then she had added sweetly:“There's no need to send a reward either. I lost my engagement ring once when I was young, and some kind, unknown person returned it to me the next day. I feel I'm only paying back an old debt of thanks.”
     Nancy had thanked the finder profusely and asked her name, but the other woman had said that it wasn't important. And, now, here was the ring once again in her hand. She put it back on her finger and breathed a huge sigh of relief.