Answer:
C. They frequently show life in the city.
D. Their brushwork is very controlled and polished.
Step-by-step explanation:
John Sloan was an American painter who is considered to be one of the founders of the Ashcan school of American art. Sloan frequently painted with an anti-war and socialist point of view, and his art is considered to be political and social. Sloan was able to depict the life of New York City in the early 20th century, and is known for his polished images of life in the city.