I want to talk about a soldier. I saw him yesterday as my husband and I were enjoying a wonderful lunch in the cave-like dining room of an old hotel. It is hard to imagine being comfortable in a room that probably seats a thousand, but the real magic of the place is its wonderful setting. Every comer is a wood and stone masterpiece, with high glass windows that look out to the huge cliffs (悬崖) of the valley. A man entered with his family and took a seat. He wasn’t in uniform, but he walked with the dignity of a soldier, and a slight limp (瘸). My suspicion was confirmed when he removed his hat and placed it on the table where I could see it. Embroidered (绣)on the cap were the words:" Iwo Jima Survivor". As they were waiting for lunch, the others talking happily, this gentleman was staring out of the window. He was content to be left out of the conversation and allowed to take in the wonderful and impressive view of the waterfall. I watched him, and imagined how much horror he had seen in the war. What losses did he suffer, and how many friends did he lose.9 what he had witnessed should have given him a good reason to lose faith in the world. Yet this tired soldier was smiling at the sky, at the sun and the roaring of the waterfall. Somehow, after everything, the world was still beautiful to him. I walked over to him and said," Excuse me, sir. I’m sorry to interrupt, but I saw your hat, and I just wanted to say thank you for serving. " He looked up at me, surprised, and said proudly," You’re welcome, and thank you, too. " I told him I would go home and tell my children about this experience that I’d met him. What encouraged the author to talk to the soldier

A. His disability.
B. His loneliness.
C. His contribution to his country.
D. His bravery to fight in the war.