What notable book did Jacob Riis write?

Jacob Riis wrote "How The Other Half Lives," which is a groundbreaking work that highlighted the harsh living conditions of the urban poor in New York City during the late 19th century. This book is notable for being one of the first comprehensive studies of poverty in America and it employed both vivid descriptions and powerful photographs, many of which were taken by Riis himself.

Through his writing, Riis aimed to raise public awareness and generate empathy towards the struggles faced by immigrants and the underprivileged. His work played a key role in social reform movements of the time, helping to instigate changes in housing, labor laws, and public health in New York City. The book’s significance lies in its ability to combine journalism with social commentary, making it an essential text in understanding the era's socio-economic conditions.

While other choices represent significant works by different authors and cover various themes—like the struggles of immigrants in "Street Life in New York," the depiction of the meatpacking industry in "The Jungle," and the poetry collection "Leaves of Grass"—none carry the specific focus and social impact of Riis's work as it relates to urban poverty and reform in New York City.