Read the following article and select the best answer. Article: Charles Dickens was one of the most beloved storytellers in the English language. His novels made him famous in his own time, and continue as classics in ours. Dickens began his literary career with almost no formal education. He was born in Landport, on Feb. 7, 1812, the second of eight children. When he was 12, his father was sent to debtor's prison. Dickens was forced to quit school and work in a London blacking factory. He would rework that terrible experience into his fiction for the rest of his life. "He was a social reformer," says actor Simon Callow, author of a new biography called Charles Dickens and the Great Theatre of the World. "He knew what poverty was. He knew what it was to be rejected, to be cast aside, to live in squalor ." And so Dickens wrote with great sympathy for the suffering of innocent and vulnerable children - characters like David Copperfield, Little Dorrit and the orphan, Oliver Twist: With his slice of bread in his hand, and his little brown parish cap on his head, Oliver was now led away from the wretched home, where one kind word or look never lighted the gloom of his infant days. Yet he burst into an agony of childish grief as the cottage gate closed after him. Wretched as were the little companions in,misery he was now leaving behind him, they were the only friends he had ever had. His first book Sketches by Boz came out in 1836. With the appearance of Oliver Twist in London periodicals in 1837, the 25-year-old Dickens became the most popular writer in England. But his first love was theater, and he considered becoming an actor. "When he was actually writing, he became his characters," says Peter Ackroyd, author of Dickens: Public Life and Private Passion. "He would get up from his desk, go over to the mirror and mouth the words - do the expressions, grimaces , whatever, and then laugh, chuckle to himself, then go back to his desk and write it down." Dickens created 989 named characters, which increased his popularity.... Question: It can be inferred from the passage that _ - Sketches by Boz is nothing but a complete failure - Oliver Twist made Dickens first known to the public - A Christrwas Carol proved Dickens an efficient writer - Our Mutual Friend came into being on a train
The answer to this question is:
A Christrwas Carol proved Dickens an efficient writer