Walter Wetzel had met Ryan Lamantia nearly eight years ago in a hospital waiting room. Both were very sick—Ryan with brain cancer, Walter with leukemia. Walter, then 9，began making silly faces at the little boy sitting across from him.
Soon after, Ryan, who was 3 at the time, made his way into Walter's room and chatted about going home to change into his Teenage Mutant Ninja Turtles costume and ride his Big Wheel to his cousin Catlyn's house.
Though they saw each other only a handful of times after that, Walter never forgot Ryan. “He inspired me to survive my cancer，” said Walter, now 17，a football player and snowboarder. “Seeing him happy all the time made me happy. How could I be upset if he had it so much worse than me?”
For the past few years, Walter, who lived with his family in Elgin, wondered what had happened to his little friend. Without so much as a last name, Walter asked the hospital staff to track down a number or address, but privacy laws  prohibited  the staff from giving out information.
"As I was going to bed one night, it popped in my head：6Google it. Google what you know，"said Walter's mother, Erzsi Gemzsi. She typed in "Ryan Lake in the Hills brain tumor”. Much to her surprise a link to a Facebook page for Ryan came up. Finally, they had found him. But when she clicked her mouse, the news was devastating.
Ryan had died on Sept. 8，2005. He was 6.
When she picked up Walter from school the next day, she broke it to him. “It hit me pretty hard，” Walter said. “ I was crying for a week straight. ”
The Facebook page was for the Ryan Lamantia Foundation, a nonprofit foundation that Ryan's family formed after his death. The organization raises money for pediatric (小儿科的）brain tumor research.
Walter logged on right away and left this message：
"I have wanted nothing more than to talk to (Ryan's) parents and tell them ( their) son is my hero. My trips to（the hospital)were always dreadful, until the day I(met) Ryan. ”
Ryan's mom's eyes filled with tears as she read Walter's post. She said，“It made us so proud. ”
What made a deep impression on Walter Wetzel?

A．Ryan's way to communicate with others.

B．Ryan's love for his costume and Big Wheel.

C．Ryan's panic when suffering from brain cancer.

D．Ryan's happiness though suffering from brain cancer.

What can be learned from the passage?

A．Ryan was working for a foundation.

B．Walter was recovering from his leukemia.

C．Walter and Ryan often wrote to each other after they left the hospital.

D．After Ryan left the hospital, he was in good health.

The underlined word "prohibited" in Paragraph 4 is the closest to "__________" in meaning.

A．banned

B．permitted

C．advised

D．published

How did Walter manage to know Ryan's information?

A．One of his friends came to tell him.

B．Ryan's mother telephoned Walter and told him.

C．His mother googled Ryan's information and found it.

D．The Ryan Lamantia Foundation contacted him and told him.