Read the passage and choose the best answer A, B, C or D.

We find many people who have achieved extraordinary successes in their life and follow them as our inspiration. But he’s an exception. He is Nicholas James Vujicic, a motivational speaker from Australia, who can better be introduced as a half human being, accepting challenges of life with a great smile. Vujicic was born in Melbourne, Australia, in 1982. He was born without fully formed limbs. Throughout his childhood, Nick not only dealt with the typical challenges of school and adolescence, but he also struggled with depression and loneliness. According to Nick, the victory over his struggles, as well as his strength and passion for life today, can be credited to his faith in God. His family, friends and the many people he has encountered along the journey have inspired him to carry on, as well. During his stay in Vietnam, from May 22-25, 2013, Nick Vujicic had talks with 4,000 business people with the message ―Never give up‖ at the White Palace Conference Centre in Ho Chi Minh City, spoke to 25,000 students from universities in Hanoi at My Dinh National Stadium under the theme ―Never give up desire‖ and 5,500 disadvantaged children at Quan Ngua Sport Palace. Also, he autographed a ball and kicked the ball to start the football tournament of disadvantaged children at Military Zone 7 Sporting Hall and talked with 4,000 children at Thong Nhat Stadium in Ho Chi Minh City. With lively stories about his long journey to struggle mentally, emotionally and physically to have a normal life like other people, Nick Vujicic has convinced thousands of Vietnamese through not only his books but also his motivational talks to those who participated in his activities in Vietnam. In the program ―Hello Vietnam‖, Ms. Bich Lan, who has translated the books ―Life without Limits‖ and ―Unstoppable‖ by Nick Vujicic into Vietnamese, said with emotion: ―Nick Vujicic is a shining star in the dark night and is the symbol of a soul with a strongly spreading vitality and continuous enthusiasm reaching a level of unlimited will, love without borders, dedication and boundless happiness.‖

What does Vujicic suffer from?