Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it landed upside down in three feet of water. Mr. Johnson took the only escape route--through the boot(行李箱). Mr. Johnson’s car had finished up in a ditch (沟渠) at Romney Marsin, Kent after skidding on ice and hitting a bank. "Fortunately, the water began to come in only slowly," Mr. Johnson said. "I couldn’t force the doors because they were jammed against the walls of the ditch and dared not open the windows because I knew water would come flooding in." Mr. Johnson, a sweet salesman of Sitting Home, Kent, first tried to attract the attention of other motorists by sounding the horn and hammering on the roof and boot. Then he began his struggle to escape. Later he said," It was really a half penny that saved my life. It was the only coin I had in my pocket and I used it to unscrew the back seat to get into the boot. I hammered desperately with a hammer trying to make someone hear, but no help came." It took ten minutes to unscrew the seat, and a further five minutes to clear the sweet sampies from the boot. Then Mr. Johnson found a wrench and began to work on the boot lock. Fifteen minutes passed by. "It was the only chance I had. Finally it gave, but as soon as I moved the boot lid, the water and mud poured in. I forced the lid down into the mud and scrambled clear as the car filled up." His hands and arms cut and bruised (擦伤), Mr. Johnson got to Beckett Farm nearby, where he was looked after by the farmer’s wife, Mrs. Lucy Bates. Huddled in a blanket, he said, "That thirty minutes seemed like hours." Only the tips of the car wheels were visible, police said last night. The vehicle had sunk into two feet of mud at the bottom of the ditch. Which of the following objects is the most important to Mr. Johnson ______.
A. The hammer.
B. The coin.
C. The screw.
D. The horn.
(三) 赵某孤身一人,因外出打工,将一祖传古董交由邻居钱某保管。钱某因结婚用钱,情急之下谎称该古董为自己所有,卖给了古董收藏商孙某,得款10000元。孙某因资金周转需要,向李某借款20000元,双方约定将该古董押给李某,如孙某到期不回赎,古董归李某所有。在赵某外出打工期间,其住房有倒塌危险,因此房与钱某的房屋相邻,如该房屋倒塌,有危及钱某房屋之虞。钱某遂请施工队修缮赵某的房屋,并约定,施工费用待赵某回来后由赵某付款。房屋修缮以后,因遇百年不遇的台风而倒塌。年末,赵某回村,因古董和房屋修缮款与钱某发生纠纷。 请回答以下各题: 孙某将古董当给李某,因而形成的法律关系是( )。
A. 保管法律关系
B. 买卖法律关系
C. 典当法律关系
D. 质押法律关系