The Diary of a Young Girl, a wartime record published after the writer's death, was written by

The correct answer is B, Anne Frank. The Diary of a Young Girl is the diary kept by Anne Frank while her family was in hiding in Amsterdam during the Second World War. She died in a concentration camp, and the diary was published afterwards by her father, the only member of the family to survive, which is why the question mentions posthumous publication.

Option A, Helen Keller, wrote The Story of My Life, her own account of learning to communicate despite being deaf and blind from infancy. Option C, Malala Yousafzai, wrote I Am Malala, about the attack on her in the Swat valley and her campaign for the education of girls. Option D, Pearl S. Buck, was a novelist best known for The Good Earth, a work of fiction set in China and not a diary.