Which facts presented by Marx, Stoker, and Suri (2013) best characterize slums as reflecting spatial poverty traps? A. Many slum dwellers live in extremely crowded conditions, and overcrowding leads to worse public health outcomes. B. Slum dwellers have poor access to public goods like clean water and solid waste disposal infrastructure, and this increases the spread of disease. C. In many countries, slums have been growing for decades, and millions find themselves trapped in slums for generations. D. All of the above